Preparation process of dibenzofuran derivative

Abstract

The invention provides a preparation process of a dibenzofuran derivative, and relates to the technical field of dibenzofuran preparation.The preparation process comprises a rotary evaporator, and the rotary evaporator is provided with an adjusting mechanism facilitating preparation of the dibenzofuran derivative; the rotary evaporator is provided with a liquid adding mechanism convenient for adding liquid during preparation of the dibenzofuran derivative, the adjusting mechanism comprises a height adjuster and a rotary adjuster, the liquid adding mechanism comprises a side edge plate, a movable plate, a vertical rod, a rack, a collecting tank and an inclined guide plate, and the side end part of the rotary evaporator is provided with a control panel. The height adjuster is fixedly mounted at the upper end part of the rotary evaporator. According to the water bath kettle, the inclined guide plate is arranged, water vapor is recycled through the inclined guide plate, the water vapor is condensed into small water drops on the inclined guide plate, then the recycled water is guided into the water bath kettle again through the thin guide pipe, and water loss caused by water evaporation of the water bath kettle can be effectively reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of dibenzofuran preparation, and more specifically, particularly relates to a preparation process of dibenzofuran derivatives. Background Art

[0002] Dibenzofuran derivatives are a series of compounds that are based on dibenzofuran and have other atoms, groups or substituents introduced into their molecular structure through chemical reactions. These derivatives are different from dibenzofuran in structure and properties and have a wider range of applications.

[0003] In the preparation of dibenzofuran derivatives, when dibenzofuran derivatives are prepared by organic synthesis methods such as Grignard reaction, the mixed solution after the reaction contains the target product (dibenzofuran derivative), unreacted raw materials (such as o-halogen phenol substrates, 2,3-difluorohalogenated benzene substrates, etc.), reaction solvents (such as tetrahydrofuran, toluene, etc.) and possible by-products. The rotary evaporator is used to evaporate the reaction solvent at this time, so that the relative content of the target product and other components changes. By evaporating the solvent under reduced pressure, the target product is concentrated, and some volatile impurities may also be removed along with the solvent, thereby achieving preliminary separation and purification.

[0004] The existing evaporation process of the solution prepared from dibenzofuran derivatives has the following disadvantages:

[0005] 1. The existing rotary evaporator is not equipped with a water vapor recovery structure. During the use of the rotary evaporator, a large amount of water vapor evaporates and escapes, which will cause a waste of water resources and a decrease in the water level in the water bath. When the rotary evaporator needs to be used multiple times for operations such as solution concentration, constantly adding new water to maintain the water level in the water bath will consume more water resources;

[0006] 2. As water vapor continues to escape, the water level in the water bath will continue to drop, which requires frequent addition of water to the water bath. Each time new water is added to the water bath, the water temperature will fluctuate because the temperature of the newly added water is usually different from the water in the water bath, which will affect the heating stability of the rotary evaporator. To ensure that the impact on the water temperature is reduced, it is necessary to manually add a small amount of water for a long time, which is labor-intensive. Finally, the water temperature must be heated to the appropriate temperature before adding water, which is also labor-intensive and inefficient.

[0007] In view of this, the existing structure and defects are studied and improved, and a preparation process of dibenzofuran derivatives is provided, in order to achieve a purpose with greater practical value. Summary of the invention

[0008] In order to solve the above technical problems, the present invention provides a preparation process of dibenzofuran derivatives to solve the above problems.

[0009] A process for preparing dibenzofuran derivatives, comprising a rotary evaporator, wherein the rotary evaporator is provided with an adjustment mechanism for facilitating the preparation of dibenzofuran derivatives, wherein the rotary evaporator is provided with a liquid adding mechanism for facilitating the addition of liquid during the preparation of dibenzofuran derivatives, wherein the adjustment mechanism comprises a height adjuster and a rotation adjuster, wherein the liquid adding mechanism comprises a side plate, a movable plate, a vertical rod, a rack, a collecting tank and an inclined guide plate, wherein a control panel is provided at a side end of the rotary evaporator, wherein the height adjuster is fixedly mounted at an upper end of the rotary evaporator, and wherein the rotation adjuster is fixedly mounted at a height adjuster. The side end of the regulator, the side plate is fixedly installed on the side end of the rotary evaporator, the movable plate is located at the upper end of the side plate, the number of the vertical rods is two, the two vertical rods are fixedly installed on the upper end of the movable plate, the rack is located at the side end of the vertical rod, the collecting tank is located between the two vertical rods, the side ends of the two vertical rods are penetrated with a second circular groove, the two side ends of the inclined guide plate are fixedly installed with a rotating shaft, the two rotating shafts are penetrated and rotatably installed on the inner side wall of the second circular groove, the upper end of the rotary evaporator is provided with a water bath, and the inner side wall of the rotary regulator A beaker is provided, the end of the beaker is located on the inner wall of the water bath, a joint pipe is fixedly installed on the side end of the beaker, a first circular groove is penetrated through the upper end of the side plate, a first threaded rod is rotatably installed on the inner wall of the first circular groove, a catheter groove is penetrated through the upper end of the movable plate, two telescopic rods are fixedly installed between the movable plate and the side plate, a first threaded groove is penetrated through the upper end of the movable plate, the first threaded rod is threadedly rotatably installed on the inner wall of the first threaded groove, a rectangular slide groove is provided on the side ends of the two vertical rods, and two ends of the vertical rods are provided with a plurality of The side ends are fixedly installed with L-shaped side rods, and the side ends of the two L-shaped side rods are penetrated with a third circular groove. The rack is located between the two L-shaped side rods, and the lower end of the rack is fixedly installed with a movable block, and the side end of the movable block is penetrated with a second threaded groove, and the same second threaded rod is rotatably installed between the two third circular grooves, and the second threaded rod is threadably installed on the inner side wall of the second threaded groove, and the lower end of the collecting tank is fixedly installed with a connecting head, and the side end of the connecting head is provided with a regulating valve, and the lower end of the connecting head is fixedly installed with a thin catheter.

[0010] Preferably, sliding rods are fixedly mounted on both side ends of the collecting trough, and the two sliding rods are respectively slidably mounted on the inner side walls of the rectangular sliding groove.

[0011] Preferably, a gear is fixedly mounted on the circumferential end of the rotating shaft, and the rack is meshed with the gear.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] In the present invention, an inclined guide plate is provided to recover water vapor through the inclined guide plate, so that the water vapor condenses into small water droplets on the inclined guide plate, and then the recovered water is reintroduced into the water bath through a fine guide tube, which can effectively reduce the water loss of the water bath due to water evaporation, and thus there is no need to frequently add new water to the water bath during the entire experimental process, which can save manpower and water resources.

[0014] In the present invention, by cooperating with a thin conduit, when water is led back into the water bath, a small amount of water can be continuously led back into the water bath through the thin conduit, and the water temperature in the water bath can be continuously and in small amounts added to the water bath, so that the water temperature fluctuation in the water bath is small, and the stability of the evaporation efficiency of the solution in the beaker is ensured, and there is no need to manually add new water, and it is also necessary to perform temperature control and other operations, so that the solution in the beaker is continuously evaporating, reducing manual intervention.

[0015] In the present invention, by providing a connector and a regulating valve in cooperation, the flow rate of recycled water is controlled by the adjustable regulating valve, so that the recycled water can be accurately added to the water bath, which can effectively avoid the water level of the water bath rising rapidly or even overflowing due to excessive reflux water, or the water loss due to evaporation cannot be fully supplemented due to insufficient reflux water, so that the entire evaporation process is more stable.

[0016] In the present invention, by providing an angle-adjustable inclined guide plate, the user can adjust the angle of the inclined guide plate according to the actual needs of the dibenzofuran process capital. For example, when initially sewing the beaker, the inclined guide plate is adjusted to a vertical rotary evaporator state to avoid the inclined guide plate from affecting the operation of the early staff, or the angle of the inclined guide plate can be changed during the subsequent water droplet recovery to achieve different recovery rates, making the use of the inclined guide plate more flexible.

[0017] In the present invention, by providing an inclined guide plate with adjustable height, in the actual preparation process, the height of the inclined guide plate can be changed according to the heating temperature in the water bath and the amount of water vapor, so as to avoid water droplets accumulating and dripping on the beaker due to the inclined guide plate being too low, or water vapor escaping due to the inclined guide plate being too high, resulting in recovery failure. The user can adjust the inclined guide plate to a suitable position to ensure the effect of water vapor recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a rotary evaporator of the present invention;

[0019] Figure 2 It is a front structural schematic diagram of the rotary evaporator of the present invention;

[0020] Figure 3 It is a schematic diagram of the side structure of the rotary evaporator of the present invention;

[0021] Figure 4It is a schematic diagram of the structure explosion of the side plate of the present invention;

[0022] Figure 5 It is a schematic diagram of the structure explosion of the inclined guide plate of the present invention;

[0023] Figure 6 It is a schematic diagram of the structure explosion of the collecting tank of the present invention;

[0024] Figure 7 is a schematic diagram of the structure of the thin catheter of the present invention;

[0025] Figure 8 It is a structural schematic diagram of the vertical pole of the present invention.

[0026] In the figure, the correspondence between the component names and the figure numbers is: 1. Rotary evaporator; 11. Control panel; 12. Water bath; 13. Height adjuster; 14. Rotary adjuster; 15. Beaker; 16. Connector pipe; 2. Side panel; 21. First circular groove; 22. First threaded rod; 3. Movable plate; 31. Catheter groove; 32. Telescopic rod; 33. First threaded groove; 4. Vertical rod; 41. Rectangular slide groove; 42. Second circular groove; 43. L-shaped side rod; 45. Third circular groove; 5. Rack; 51. Movable block; 52. Second threaded groove; 53. Second threaded rod; 6. Collecting tank; 61. Connector; 62. Regulating valve; 63. Thin catheter; 64. Sliding rod; 7. Inclined guide plate; 71. Rotating shaft; 72. Gear. DETAILED DESCRIPTION

[0027] The following is a further detailed description of the embodiments of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0028] See also Figure 1 - Figure 8The present invention provides a preparation process of dibenzofuran derivatives, including a rotary evaporator 1, wherein the rotary evaporator 1 is provided with an adjustment mechanism for facilitating the preparation of dibenzofuran derivatives, and the rotary evaporator 1 is provided with a liquid adding mechanism for facilitating the addition of liquid during the preparation of dibenzofuran derivatives, wherein the adjustment mechanism includes a height adjuster 13 and a rotation adjuster 14, and the liquid adding mechanism includes a side plate 2, a movable plate 3, a vertical rod 4, a rack 5, a collecting tank 6 and an inclined guide plate 7, and a control panel 11 is provided at the side end of the rotary evaporator 1, the height adjuster 13 is fixedly mounted on the upper end of the rotary evaporator 1, the rotation adjuster 14 is fixedly mounted on the side end of the height adjuster 13, the side plate 2 is fixedly mounted on the side end of the rotary evaporator 1, the movable plate 3 is located at the upper end of the side plate 2, and the number of the vertical rods 4 is two, and the two vertical rods 4 They are all fixedly installed on the upper end of the movable plate 3, the rack 5 is located at the side end of the vertical rod 4, the collecting tank 6 is located between the two vertical rods 4, the side ends of the two vertical rods 4 are penetrated with a second circular groove 42, and the two side ends of the inclined guide plate 7 are fixedly installed with a rotating shaft 71, and the two rotating shafts 71 are penetrated and rotatably installed on the inner side wall of the second circular groove 42. When the water in the water bath 12 on the rotary evaporator 1 is heated and the film in the beaker 15 is evaporated, the water in the water bath 12 is heated and evaporated, which will cause the water level in the water bath 12 to decrease. After the water in the water bath 12 evaporates, the water vapor will encounter the inclined guide plate 7 upwards. After the water vapor contacts the inclined guide plate 7, it will condense into fine water droplets. After a certain amount of water droplets accumulate on the inclined guide plate 7, because the inclined guide plate 7 is inclined, the water droplets will slide into the collecting tank 6 due to gravity;

[0029] A water bath 12 is provided at the upper end of the rotary evaporator 1, and a beaker 15 is provided on the inner side wall of the rotary regulator 14. The end of the beaker 15 is located on the inner side wall of the water bath 12, and a joint pipe 16 is fixedly installed on the side end of the beaker 15. When purifying a solution, the solution can be placed in the beaker 15, and the beaker 15 is installed on the rotary regulator 14. The condensation device is connected through the joint pipe 16 on the beaker 15, and the height of the rotary regulator 14 is adjusted by the height regulator 13, so that the end of the beaker 15 is immersed in the water level in the rotary evaporator 1. At this time, the user can turn on the rotary evaporator 1 and the rotary regulator 14. The rotary regulator 14 will drive the beaker 15 to rotate so that the solution forms a thin film in the beaker 15. When the rotary evaporator 1 is started, the water in the water bath 12 will be heated, thereby providing heat to evaporate the solution film in the flask;

[0030] The upper end of the side plate 2 is penetrated with a first circular groove 21, and the inner side wall of the first circular groove 21 is rotatably mounted with a first threaded rod 22. The upper end of the movable plate 3 is penetrated with a guide groove 31, and two telescopic rods 32 are fixedly installed between the movable plate 3 and the side plate 2. The upper end of the movable plate 3 is penetrated with a first threaded groove 33, and the first threaded rod 22 is threadedly rotatably mounted on the inner side wall of the first threaded groove 33. When the inclined guide plate 7 is in use, the user can also adjust the height of the inclined guide plate 7. The user can rotate the first threaded rod 22 forward or reversely. 2. The first threaded rod 22 rotates through the first threaded groove 33 to drive the movable plate 3 to move upward or downward, thereby driving the inclined guide plate 7 to move upward or downward through the two vertical rods 4. In the actual preparation process, the height of the inclined guide plate 7 can be changed according to the heating temperature in the water bath 12 and the amount of water vapor, so as to avoid the inclined guide plate 7 being too low to cause water droplets to accumulate and drip onto the beaker 15, or the inclined guide plate 7 being too high to cause water vapor to escape, resulting in recovery failure. The user can adjust the inclined guide plate 7 to a suitable position to ensure the effect of water vapor recovery;

[0031] A rectangular slide groove 41 is provided at the side ends of the two uprights 4, an L-shaped side rod 43 is fixedly installed at the two side ends of the uprights 4, a third circular groove 45 is penetrated through the side ends of the two L-shaped side rods 43, the rack 5 is located between the two L-shaped side rods 43, a movable block 51 is fixedly installed at the lower end of the rack 5, a second threaded groove 52 is penetrated through the side end of the movable block 51, a second threaded rod 53 is rotatably installed between the two third circular grooves 45, the second threaded rod 53 is threadedly rotatably installed on the inner side wall of the second threaded groove 52, a connector 61 is fixedly installed at the lower end of the collecting tank 6, a regulating valve 62 is provided at the side end of the connector 61, a thin guide tube 63 is fixedly installed at the lower end of the connector 61, and the collecting tank Slide bars 64 are fixedly installed on both side ends of 6, and the two slide bars 64 are slidably installed on the inner side walls of the rectangular slide groove 41 respectively. The collecting groove 6 will collect the water droplets condensed from the water vapor after evaporation in the water bath 12. When the water level in the water bath 12 drops, it is necessary to add water to the water bath 12 to ensure that the water level can submerge the solution part of the beaker 15. The user can open the regulating valve 62. At this time, the water in the collecting groove 6 will enter the thin conduit 63 through the connector 61, and the collected water will enter the water bath 12 again through the thin conduit 63. The pipeline of the thin conduit 63 is small, and the amount of water added can be added in a small amount continuously, so as to avoid a sudden drop in the water temperature in the water bath 12 caused by adding too much water, which affects the evaporation of the solution in the beaker 15.

[0032] A gear 72 is fixedly installed on the circumferential end of the rotating shaft 71, and the rack 5 and the gear 72 are meshed. When the inclined guide plate 7 is actually used, the user can also adjust the angle of the inclined guide plate 7 according to actual use needs. The user can rotate the second threaded rod 53 in the forward or reverse direction. The second threaded rod 53 rotates through the second threaded groove 52 to drive the movable block 51 to move. The movement of the movable block 51 will drive the rack 5 to move. The movement of the rack 5 will drive the gear 72 to rotate. The rotation of the gear 72 will drive the rotating shaft 71 to rotate. The rotation of the rotating shaft 71 will drive the inclined guide plate 7 to rotate, thereby realizing the adjustment of the angle of the inclined guide plate 7. The user can adjust the inclined guide plate 7 to the state of the vertical rotary evaporator 1 according to actual operation needs, such as when initially sewing the beaker 15, to avoid the inclined inclined guide plate 7 may affect the early staff to fix the beaker 15, or in the subsequent recovery of water vapor, the recovery rate of water droplets can be changed by changing the inclination angle of the inclined guide plate 7.

[0033] Working principle:

[0034] In the first step, when preparing dibenzofuran derivatives by organic synthesis methods such as Grignard reaction, the mixed solution after the reaction contains the target product dibenzofuran derivatives, unreacted raw materials such as o-halogenated phenol substrates, 2,3-difluorohalogenated benzene substrates, etc., reaction solvents such as tetrahydrofuran, toluene, etc., and possible by-products. The rotary evaporator 1 can change the relative content of the target product and other components by evaporating the solvent. By evaporating the solvent under reduced pressure, the target product is concentrated, and some volatile impurities may also be removed together with the solvent, thereby achieving preliminary separation. When purifying a solution, the solution can be placed in a beaker 15, which is mounted on a rotary regulator 14, connected to a condensation device via a joint pipe 16 on the beaker 15, and the height of the rotary regulator 14 is adjusted via a height regulator 13, so that the end of the beaker 15 is immersed in the water level in the rotary evaporator 1. At this time, the user can turn on the rotary evaporator 1 and the rotary regulator 14, and the rotary regulator 14 will drive the beaker 15 to rotate so that the solution forms a thin film in the beaker 15. The start of the rotary evaporator 1 will heat the water in the water bath 12, thereby providing heat to evaporate the solution film in the flask;

[0035] In the second step, the water in the water bath 12 on the rotary evaporator 1 is heated. When the film in the beaker 15 is evaporated, the water in the water bath 12 is heated and evaporated, which will cause the water level in the water bath 12 to decrease. After the water in the water bath 12 evaporates, the water vapor will encounter the inclined guide plate 7 upward. After the water vapor contacts the inclined guide plate 7, it will condense into fine water droplets. After a certain amount of water droplets accumulate on the inclined guide plate 7, because the inclined guide plate 7 is inclined, the water droplets will slide into the collecting tank 6 due to gravity. The collecting tank 6 will collect the condensed water vapor after evaporation in the water bath 12. The water droplets are collected. When the water level in the water bath 12 drops, water needs to be added to the water bath 12 to ensure that the water level can submerge the solution part of the beaker 15. The user can open the regulating valve 62. At this time, the water in the collecting tank 6 will enter the fine conduit 63 through the connector 61. The collected water will enter the water bath 12 again through the fine conduit 63. The fine conduit 63 is small, and the amount of water added can be added in a small amount continuously, so as to avoid a sudden drop in the water temperature in the water bath 12 caused by adding too much water, which affects the evaporation of the solution in the beaker 15.

[0036] The device is provided with an inclined guide plate 7, and water vapor is recovered through the inclined guide plate 7, so that the water vapor condenses into small water droplets on the inclined guide plate 7, and then the recovered water is reintroduced into the water bath 12 through the fine guide tube 63, which can effectively reduce the water loss of the water bath 12 caused by water evaporation, and thus it is not necessary to frequently add new water to the water bath 12 during the entire experiment, which can save manpower and water resources;

[0037] The device is provided with a thin conduit 63, and when the water is directed back into the water bath 12, a small amount of water can be continuously directed back into the water bath 12 through the thin conduit 63, and the water can be continuously and in small amounts added to the water bath 12, so that the water temperature in the water bath 12 can fluctuate less, and the evaporation efficiency of the solution in the beaker 15 can be ensured to be stable, without the need to manually add new water, and to perform temperature control and other operations, so that the solution in the beaker 15 can be continuously evaporating, reducing manual intervention;

[0038] The device is provided with a connector 61 and a regulating valve 62 to cooperate with each other. The flow rate of the recycled water is controlled by the adjustable regulating valve 62, and the recycled water can be accurately added to the water bath 12. This can effectively avoid the water level of the water bath 12 from rising rapidly or even overflowing due to excessive reflux water, or the water loss due to evaporation cannot be fully supplemented due to insufficient reflux water, so that the whole evaporation process is more stable.

[0039] The third step is that when the inclined guide plate 7 is actually used, the user can also adjust the angle of the inclined guide plate 7 according to actual use needs. The user can rotate the second threaded rod 53 forward or reversely. The second threaded rod 53 rotates through the second threaded groove 52 to drive the movable block 51 to move. The movement of the movable block 51 will drive the rack 5 to move. The movement of the rack 5 will drive the gear 72 to rotate. The rotation of the gear 72 will drive the rotating shaft 71 to rotate. The rotation of the rotating shaft 71 will drive the inclined guide plate 7 to rotate, thereby realizing the adjustment of the angle of the inclined guide plate 7. The user can adjust the inclined guide plate 7 to the state of the vertical rotary evaporator 1 according to actual operation needs, such as when initially sewing the beaker 15, to avoid the inclined inclined guide plate 7 may affect the early staff to fix the beaker 15, or in the subsequent recovery of water vapor, the recovery rate of water droplets can be changed by changing the inclination angle of the inclined guide plate 7;

[0040] The device is provided with an angle-adjustable inclined guide plate 7, and the user can adjust the angle of the inclined guide plate 7 according to the actual needs of the dibenzofuran process capital. For example, when the beaker 15 is initially sewn, the inclined guide plate 7 is adjusted to a state vertical to the rotary evaporator 1 to avoid the inclined inclined guide plate 7 from affecting the operation of the early staff, or the angle of the inclined guide plate 7 can be changed during the subsequent water droplet recovery to achieve different recovery rates, so that the use of the inclined guide plate 7 is more flexible;

[0041] In the fourth step, when the inclined guide plate 7 is in use, the user can also adjust the height of the inclined guide plate 7. The user can rotate the first threaded rod 22 forward or reversely. The first threaded rod 22 rotates through the first threaded groove 33 to drive the movable plate 3 to move upward or downward, thereby driving the inclined guide plate 7 to move upward or downward through the two vertical rods 4. In the actual preparation process, the height of the inclined guide plate 7 can be changed according to the heating temperature and the amount of water vapor in the water bath 12 to avoid water droplets accumulating and dripping on the beaker 15 due to the inclined guide plate 7 being too low, or water vapor escaping due to the inclined guide plate 7 being too high, resulting in recovery failure. The user can adjust the inclined guide plate 7 to a suitable position to ensure the effect of water vapor recovery.

[0042] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A process for preparing a dibenzofuran derivative, comprising a rotary evaporator (1), characterized in that: The rotary evaporator (1) is provided with a regulating mechanism for facilitating the preparation of dibenzofuran derivatives, and the rotary evaporator (1) is provided with a liquid adding mechanism for facilitating the addition of liquid during the preparation of dibenzofuran derivatives; The adjusting mechanism comprises a height adjuster (13) and a rotary adjuster (14); the liquid adding mechanism comprises a side plate (2), a movable plate (3), a vertical rod (4), a rack (5), a collecting tank (6) and an inclined guide plate (7); a control panel (11) is provided at the side end of the rotary evaporator (1); the height adjuster (13) is fixedly mounted on the upper end of the rotary evaporator (1); the rotary adjuster (14) is fixedly mounted on the side end of the height adjuster (13); the side plate (2) is fixedly mounted on the side end of the rotary evaporator (1); The movable plate (3) is located at the upper end of the side plate (2), the number of the vertical rods (4) is two, and the two vertical rods (4) are fixedly mounted on the upper end of the movable plate (3), the rack (5) is located at the side end of the vertical rod (4), the collecting trough (6) is located between the two vertical rods (4), the side ends of the two vertical rods (4) are penetrated by a second circular groove (42), and the two side ends of the inclined guide plate (7) are fixedly mounted with a rotating shaft (71), and the two rotating shafts (71) are penetrated and rotatably mounted on the inner side wall of the second circular groove (42).

2. A process for preparing a dibenzofuran derivative as claimed in claim 1, characterized in that: A water bath (12) is provided at the upper end of the rotary evaporator (1), a beaker (15) is provided on the inner side wall of the rotary regulator (14), the end of the beaker (15) is located on the inner side wall of the water bath (12), and a joint pipe (16) is fixedly installed on the side end of the beaker (15).

3. A process for preparing a dibenzofuran derivative as claimed in claim 2, characterized in that: A first circular groove (21) is formed through the upper end of the side plate (2), and a first threaded rod (22) is rotatably mounted on the inner side wall of the first circular groove (21).

4. A process for preparing a dibenzofuran derivative as claimed in claim 3, characterized in that: The upper end of the movable plate (3) is provided with a guide tube groove (31), two telescopic rods (32) are fixedly installed between the movable plate (3) and the side plate (2), and the upper end of the movable plate (3) is provided with a first thread groove (33); Wherein, the first threaded rod (22) is threadably mounted on the inner side wall of the first threaded groove (33).

5. A process for preparing a dibenzofuran derivative as claimed in claim 4, characterized in that: The side ends of the two vertical rods (4) are both provided with rectangular sliding grooves (41), the two side ends of the vertical rods (4) are both fixedly mounted with L-shaped side rods (43), and the side ends of the two L-shaped side rods (43) are both penetrated by third circular grooves (45).

6. A process for preparing a dibenzofuran derivative as claimed in claim 5, characterized in that: The rack (5) is located between two L-shaped side rods (43); a movable block (51) is fixedly mounted on the lower end of the rack (5); and a second thread groove (52) is penetrated through the side end of the movable block (51).

7. A process for preparing a dibenzofuran derivative as claimed in claim 6, characterized in that: A second threaded rod (53) is rotatably mounted between the two third circular grooves (45), and the second threaded rod (53) is threadably mounted on the inner side wall of the second threaded groove (52).

8. A process for preparing a dibenzofuran derivative as claimed in claim 7, characterized in that: A connector (61) is fixedly mounted on the lower end of the collecting tank (6), a regulating valve (62) is provided on the side end of the connector (61), and a thin conduit (63) is fixedly mounted on the lower end of the connector (61).

9. A process for preparing a dibenzofuran derivative as claimed in claim 8, characterized in that: Slide rods (64) are fixedly mounted on both side ends of the collecting trough (6), and the two slide rods (64) are respectively slidably mounted on the inner side walls of the rectangular slide groove (41).

10. A process for preparing a dibenzofuran derivative as claimed in claim 9, characterized in that: A gear (72) is fixedly mounted on the circumferential end of the rotating shaft (71), and the rack (5) and the gear (72) are meshed.

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