An electrochemical conversion method of aromatic alcohol using polypyrrole gel electrolyte as a supporting electrolyte

Abstract

The present invention discloses a method for electrochemically converting aromatic alcohols using polypyrrole gel electrolyte as a supporting electrolyte, which successively comprises the following steps: Step 1: Mixing an aromatic alcohol, a polypyrrole gel electrolyte, a traditional supporting electrolyte and an organic solvent to form an electrolyte solution, and adding the electrolyte solution into a diaphragmless electrolytic cell; Step 2: Placing a cathode material and an anode material into the diaphragmless electrolytic cell; Step 3: Connecting the cathode material and the anode material to a regulated DC power supply to carry out an electrochemically converting reaction of the aromatic alcohol to generate an aromatic aldehyde. In the present invention, the "synergistic effect" between the polypyrrole gel and the traditional supporting electrolyte greatly reduces the dependence of the organic electrochemical reaction on the traditional supporting electrolyte. The polypyrrole gel electrolyte and a very small amount of the traditional supporting electrolyte can enable the electrochemical reaction to proceed quickly and efficiently, and the reaction has good selectivity.

Description

Technical Field

[0001] The present invention belongs to the field of organic electrosynthesis, and relates to a method for electrochemically converting aromatic alcohols using polypyrrole gel electrolyte as a supporting electrolyte. Background Art

[0002] In organic electrosynthesis, most organic solvents have very high resistance, which not only increases the power consumption, but also causes the temperature of the reaction system to rise, leading to side reactions. Therefore, it is often necessary to add an excessive amount of supporting electrolyte to reduce the resistance of the reaction system. Commonly used supporting electrolytes include LiClO4, NaClO4, R4N + ClO4 - 、R4N + X - etc. as supporting electrolytes. However, these traditional supporting electrolytes are not only expensive, but also their addition amount is very large, often several times that of the reaction substrate. In addition, the post-treatment of the supporting electrolyte is difficult, it is difficult to recycle, and it is easy to cause corresponding waste and environmental pollution. Therefore, it is an inevitable trend to develop electrolytes that are easy to recycle to reduce the use amount of traditional supporting electrolytes.

[0003] In view of the shortcomings of traditional supporting electrolytes in electrosynthesis applications, Yoshida et al. (The Journal of Organic Chemistry, 1980, 45: 5269-5273) used bead-shaped resin - a polymer reagent generated by the electrochemical action of poly(4-vinylpyridine hydrobromide) for the oxidation of secondary alcohols. This bead-shaped resin can be recycled as a supporting electrolyte. Francke et al. (Angewandte Chemie-International Edition, 2018, 57(2): 422-426) developed a soluble poly(methacrylate) electrolyte, which was used for the electrooxidation of alcohols, and could be recycled by dialysis or ultrafiltration. However, these polyelectrolytes have problems such as complex preparation processes and long time.

[0004] Conductive polymers such as polypyrrole and polyaniline can be used in solar cells to reduce the charge transfer resistance of the reaction system, improve the ionic conductivity, and for I - / I3 -Electrocatalytic activity of redox couples (Journal of Power Sources 2014, 254, 98 - 105). The preparation process of polypyrrole gel is simple and it is easy to recycle, but its application as an electrolyte in the electrochemical conversion of organic compounds has not been reported. At the same time, the adaptability of its microporous structure to different organic reaction substrates needs to be further improved. The present invention uses a doping method to adjust the structure of polypyrrole gel, improve the problem of high resistance in the organic electrosynthesis reaction system, and apply it to the electrochemical conversion system of aromatic alcohols, which can not only reduce the usage amount of traditional supporting electrolytes, but also further improve the electro - oxidation conversion rate of aromatic alcohols. Summary of the Invention

[0005] The present invention provides a method for electrochemical conversion of aromatic alcohols using polypyrrole gel electrolyte as a supporting electrolyte, which can effectively improve the electro - oxidation conversion rate of aromatic alcohols and the selectivity of generating corresponding aromatic aldehydes while reducing the usage amount of traditional supporting electrolytes.

[0006] To solve the above - mentioned technical problems, the present invention adopts the following technical solutions:

[0007] A method for electrochemical conversion of aromatic alcohols shown in formula (Ⅰ) using polypyrrole gel electrolyte as a supporting electrolyte successively includes the following steps:

[0008] Step 1: Mix aromatic alcohol, polypyrrole gel electrolyte, traditional supporting electrolyte and organic solvent to form an electrolyte solution. In the electrolyte solution, the initial concentrations of aromatic alcohol, polypyrrole gel electrolyte and traditional supporting electrolyte are 1 - 13.8 g / L, 0.5 - 2 g / L, 0.005 - 0.05 mol / L respectively. Add the electrolyte solution into a diaphragm - free electrolytic cell; the polypyrrole gel is undoped or doped with sodium dodecylbenzenesulfonate (DBSNa), dodecylbenzenesulfonic acid (DBSA) or tartrazine (Tz), and its typical structure is shown in formula (III);

[0009]

[0010] In formula (Ⅲ), A is a dopant or H, and the dopants are sodium dodecylbenzenesulfonate (DBSNa), dodecylbenzenesulfonic acid (DBSA) or tartrazine (Tz), etc.;

[0011] Step 2: Put the cathode material and anode material into the diaphragm - free electrolytic cell;

[0012] Step 3: Connect the cathode material and anode material to a stabilized DC power supply for the electrochemical conversion reaction of aromatic alcohols to generate aromatic aldehydes shown in formula (Ⅱ);

[0013] The reaction equation is as follows:

[0014]

[0015] In formula (I) or (II), R is an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, a halogen-substituted alkyl group having 1 to 4 carbon atoms, or a halogen.

[0016] Preferably, R is OCH3, CH3, t-Bu, Cl, or CF3.

[0017] Preferably, the organic solution is one of acetonitrile and N,N-dimethylformamide, and more preferably N,N-dimethylformamide.

[0018] Preferably, in the polypyrrole gel electrolyte represented by formula (I), A is a dopant, and more preferably A is DBSA.

[0019] Preferably, in the electrolyte solution, the initial concentration of the polypyrrole gel electrolyte is 0.8 to 1.5 g / L, and more preferably 1 g / L.

[0020] Preferably, the traditional supporting electrolyte is one of lithium perchlorate (LiClO4) and tetrabutylammonium perchlorate (TBAP), and more preferably LiClO4.

[0021] Preferably, in the electrolyte solution, the initial concentration of the traditional supporting electrolyte is 0.005 to 0.01 mol / L.

[0022] Preferably, the diaphragm-free electrolytic cell is a single-chamber electrolytic cell with a jacket for heating.

[0023] Preferably, the anode material is a carbon rod or a platinum sheet, and preferably a platinum sheet.

[0024] Preferably, the cathode material is a carbon rod or a lead sheet, and preferably a lead sheet.

[0025] Preferably, during the electrochemical conversion reaction of the aromatic alcohol, the current magnitude is 5 to 40 mA, more preferably 5 to 20 mA, and most preferably 10 mA.

[0026] Preferably, the temperature of the electrochemical conversion reaction of the aromatic alcohol is controlled at 30°C to 70°C, more preferably 50 to 70°C, and most preferably 60°C.

[0027] Preferably, the electrooxidation conversion reaction of the aromatic alcohol is carried out under stirring, and the stirring rate is 100 rpm to 800 rpm, more preferably 400 to 600 rpm, and most preferably 500 rpm.

[0028] Preferably, the electrochemical conversion reaction of the aromatic alcohol is carried out under stirring, the current magnitude is controlled to be 5-40 mA, the reaction temperature is controlled to be 30 °C - 70 °C, the stirring rate is 100 rpm - 800 rpm, and the reaction time is 3 - 8 h.

[0029] The present invention particularly preferably conducts the electrochemical conversion reaction of the aromatic alcohol under stirring, controls the current magnitude to be 10 mA, the reaction temperature to be 60 °C, the stirring speed to be 500 rpm, and the reaction time to be 3 - 8 h.

[0030] The polypyrrole gel of the present invention can be prepared by referring to the methods reported in the literature. The general preparation steps are as follows: Prepare a mixed solution containing a dopant, pyrrole monomer, and a solvent (such as isopropanol, acetonitrile, etc.), quickly pour it into an oxidant (such as (NH4)2S2O8, FeCl3, H2O2, etc.) solution to initiate the polymerization reaction. After sufficient polymerization, immerse the polypyrrole hydrogel in ethanol (such as purify for 12 h) and deionized water (such as purify for 12 h) for purification in sequence, then place it in an oven for drying, and finally obtain the polypyrrole gel electrolyte after grinding. Among them, the molar ratio of the dopant to the pyrrole monomer is generally 0.02 - 0.17:1.

[0031] The beneficial effects of the present invention are as follows:

[0032] (1) The preparation process of the polypyrrole gel electrolyte has relatively low requirements and simple post-treatment. It can be recycled through filtration, reducing resource waste and saving costs.

[0033] (2) The "synergistic effect" between the polypyrrole gel and the traditional supporting electrolyte greatly reduces the dependence of the organic electrochemical reaction on the traditional supporting electrolyte. The polypyrrole gel electrolyte and a very small amount of the traditional supporting electrolyte can enable the electrochemical reaction to proceed quickly and efficiently, and the reaction has good selectivity.

[0034] (3) This method has a high yield, strong atom economy, does not produce harmful substances, is environmentally friendly, greatly reduces the usage amount of the traditional supporting electrolyte, reduces resource waste, and lowers production costs. Description of the Drawings

[0035] Figure 1 It is the cyclic voltammogram of p-MeOBzOH in different supporting electrolytes. Detailed Embodiments

[0036] To better understand the present invention, the following are specific examples of the present invention in combination with relevant drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these examples.

[0037] The polypyrrole gel electrolyte used in the examples was prepared according to the methods in the following literature:

[0038] Doped poly(3,4-ethylenedioxythiophene): Nano Letters, 2015, 15(11), 7736–7741;

[0039] Polypyrrole gel (Tz): Journal of Electroanalytical Chemistry. 2019, 832, 174-181;

[0040] Polypyrrole gel (DBSA, NaDBS): Polym Eng Sci. 2013; 53(11): 2465-2469.

[0041] The structural formulas of the aromatic alcohols used in the following examples are shown in Formulas (1-1) to (1-5):

[0042]

[0043] The structures of the corresponding target product aromatic aldehydes are shown in Formulas (2-1) to (2-5):

[0044]

[0045] Example 0:

[0046] To study whether the polypyrrole gel electrolyte has a promoting effect on the reaction and can replace the traditional supporting electrolyte, cyclic voltammetry studies of p-MeOBzOH in different supporting electrolytes were first carried out, and the test results are as Figure 1 shown. This cyclic voltammetry test was carried out in a standard three-electrode system, with a platinum disk electrode as the working electrode, a platinum sheet (20×20×0.2 mm) as the counter electrode, and Ag / AgNO3 (0.01 M AgNO3) as the reference electrode. The scanning rate was 50 mV / s, the test temperature was 25 °C, the solvent was 10 mL of acetonitrile, and the addition amount of p-MeOBzOH was 0.5 mmol. Only when polypyrrole gel (DBSA) was used as the supporting electrolyte, no redox peaks appeared in the reaction system. When 50 mmol / L LiClO4 was added as the supporting electrolyte, the corresponding oxidation peak appeared in the system. When 50 mmol / L LiClO4 and 0.01 g of polypyrrole gel electrolyte were added to the reaction system at the same time, the corresponding oxidation peak increased significantly, and the peak potential also shifted negatively, indicating that the polypyrrole gel electrolyte adsorbed LiClO4 in the solution to form a composite electrolyte, and the composite electrolyte further produced a "synergistic effect" with the remaining LiClO4 in the solution, which could accelerate the reaction rate. Therefore, the polypyrrole gel electrolyte can partially replace the traditional supporting electrolyte to a certain extent.

[0047] The electrolysis steps and results of preparing aromatic aldehydes from aromatic alcohols are as follows:

[0048] Example 1:

[0049] Add 0.069 g of p-MeOBzOH, 0.0318 g (10 mmol / L) of LiClO4, and 30 mL of solvent (N,N-dimethylformamide) into a 50 mL diaphragmless electrolytic cell. The reaction temperature is 60 °C. Use Pt as the anode and Pb as the cathode. Then add a magnetic stir bar with a size of 6 mm × 10 mm. Set the magnetic stirring speed to 500 rpm. Start the DC power supply to control the current at 10 mA and electrolyze for 4 h to obtain the target product p-methoxybenzaldehyde. The yield of the electrolysis product is analyzed by gas chromatography (GC), and the analysis method is area normalization method. The product yield is shown in Table 1 as 69.5%. Examples 2-5, Comparative Example 1:

[0050] The reaction steps are the same as those in Example 1. The difference is that different polypyrrole gel electrolytes are additionally added to the electrolyte, namely 0.03 g of polypyrrole gel electrolyte without dopant (Example 2), 0.03 g of polypyrrole gel electrolyte with DBSNa as dopant (Example 3), 0.03 g of polypyrrole gel electrolyte with DBSA as dopant (Example 4), 0.03 g of polypyrrole gel electrolyte with Tz as dopant (Example 5), and the addition amount of LiClO4 is 0.477 g (150 mmol / L) (Comparative Example 1). Carry out the above constant current electrolysis experiment, and the results are listed in Table 1.

[0051] Table 1 Electrooxidation of p-MeOBzOH to p-methoxybenzaldehyde under the action of different supporting electrolytes

[0052]

[0053] As can be seen from Table 1, at high concentration of LiClO4 (Comparative Example 1), not only the conversion rate of the reaction substrate decreases, but also the yield of the target product is only 43.3%. When the concentration of LiClO4 is relatively low (Example 1), both the conversion rate of the reaction substrate and the yield of the target product increase. However, after adding the polypyrrole gel electrolyte, the yield of the target product of the reaction increases significantly. And regardless of whether the polypyrrole gel electrolyte is doped or not, the yield of the target product is as high as over 95%. Therefore, the addition of the polypyrrole gel electrolyte effectively improves the role of the traditional supporting electrolyte and promotes the smooth progress of the electrochemical conversion reaction of aromatic alcohols.

[0054] Examples 6-15, Comparative Example 6:

[0055] The reaction steps were the same as in Example 1, except that the amount of LiClO4 used in all electrolysis experiments was reduced to 0.0159 g (5 mmol / L), or LiClO4 was not added and the power was not turned on (Comparative Example 6). The addition amount of the corresponding polypyrrole gel electrolyte was still 0.03 g. The above constant current electrolysis experiments were carried out, and the results are listed in Table 2.

[0056] Table 2 Formation of p-methoxybenzaldehyde from p-MeOBzOH at different LiClO4 concentrations

[0057]

[0058] From the above reaction results, it can be seen that when only polypyrrole gel electrolyte was added as the supporting electrolyte (Examples 7, 9, 11, 13, 15), it can be considered that no corresponding electrochemical conversion occurred, and only the oxidation reaction of p-MeOBzOH and dissolved oxygen took place; at extremely low concentrations of LiClO4, after adding polypyrrole gel, most of the examples showed a relatively large resistance of the electrolyte solution, and the electrochemical reaction could not proceed effectively (Examples 8, 10, 14); while under the action of DBSA-doped polypyrrole gel electrolyte, only 5 mmol / L LiClO4 was required to increase the yield of the target product to 97.6%. Therefore, DBSA was preferably used as the dopant for the polypyrrole gel electrolyte.

[0059] Example 16:

[0060] In a 50 mL diaphragm-free electrolytic cell, 0.069 g of p-MeOBzOH, 0.0159 g (5 mmol / L) of LiClO4, 0.03 g of DBSA-doped polypyrrole gel electrolyte, and 30 mL of solvent (N,N-dimethylformamide) were added. The reaction temperature was 60 °C. A carbon rod was used as the anode and a carbon rod was used as the cathode. Then, a magnetic stirrer with a size of 6 mm × 10 mm was added, and the magnetic stirring was set at 500 rpm. The DC power supply was started to control the current at 10 mA, and electrolysis was carried out for 4 h to obtain the target product p-methoxybenzaldehyde. The yield of the electrolysis product was analyzed by gas chromatography (GC), and the analysis method was the area normalization method. The product yield is shown in Table 3 as 83.3%.

[0061] Examples 17 - 19:

[0062] The reaction steps were the same as in Example 16, except that the dopants of the polypyrrole gel electrolyte were undoped (Example 17), DBSNa (Example 18), and Tz (Example 19) respectively. The above constant current electrolysis experiments were carried out, and the results are listed in Table 3.

[0063] Table 3 Synthesis of p-methoxybenzaldehyde from p-MeOBzOH under the action of different polypyrrole gel electrolytes

[0064]

[0065] As can be seen from the above reaction results, when LiClO4 at a low concentration is used as the supporting electrolyte and a polypyrrole gel electrolyte doped with a dopant is added, using carbon rods as the cathode and anode also has good effects, and the yield of the target product ≥ 76.2%; compared with the Pt / Pb electrode pair, under the action of the DBSA-doped polypyrrole gel, the conversion rate of the electrolysis reaction slightly decreases, but still has a high reaction selectivity. Therefore, inexpensive carbon rods can be used to replace expensive metal electrodes.

[0066] Example 20:

[0067] Add 0.069 g of p-MeOBzOH, 0.0159 g (5 mmol / L) of LiClO4, 0.03 g of polypyrrole gel electrolyte doped with DBSA recovered by filtration, 30 mL of solvent into a 50 mL diaphragm-free electrolytic cell. The reaction temperature is 60 °C. Use Pt as the anode and Pb as the cathode. Then add a magnetic stirrer with a size of 6 mm × 10 mm, set the magnetic stirring to 500 rpm, start the DC power supply to control the current at 10 mA, and electrolyze for 4 h to obtain the target product p-methoxybenzaldehyde. The yield of the electrolysis product is analyzed by gas chromatography GC, and the analysis method is the area normalization method. The product yield is shown in Table 4.

[0068] Example 21:

[0069] The reaction steps are the same as those in Example 20. The difference is that carbon rods are used as the anode and cathode for the above constant current electrolysis experiment, and the results are listed in Table 4.

[0070] Table 4 Electrochemical conversion performance of p-MeOBzOH under the action of the recovered polypyrrole gel electrolyte

[0071]

[0072] As can be seen from the above experimental results, the polypyrrole gel electrolyte recovered by simple filtration still has good effects; indicating that the recycling of the polypyrrole gel electrolyte is feasible.

[0073] Example 22: Preparation of m-methylbenzaldehyde (Formula (2-2)):

[0074] In a 50 mL diaphragmless electrolytic cell, 0.061 g of m-methylbenzyl alcohol, 0.0159 g (5 mmol / L) of LiClO4, 0.03 g of DBSA-doped polypyrrole gel electrolyte, 30 mL of solvent (acetonitrile) were added. The reaction temperature was 60 °C. Pt was used as the anode and Pb was used as the cathode. Then a stir bar with a size of 6 mm × 10 mm was added, and the magnetic stirring was set at 500 rpm. The DC power supply was started to control the current at 10 mA, and electrolysis was carried out for 4 h to obtain the target product m-methylbenzaldehyde. The yield of the electrolysis product was analyzed by gas chromatography (GC), and the analysis method was the area normalization method. The product yield was 98%.

[0075] Example 23: Preparation of p-tert-butylbenzaldehyde (Formula (2-3)):

[0076] In a 50 mL diaphragmless electrolytic cell, 0.082 g of p-tert-butylbenzyl alcohol, 0.0159 g (5 mmol / L) of LiClO4, 0.03 g of DBSA-doped polypyrrole gel electrolyte, 30 mL of solvent (acetonitrile) were added. The reaction temperature was 60 °C. Pt was used as the anode and Pb was used as the cathode. Then a stir bar with a size of 6 mm × 10 mm was added, and the magnetic stirring was set at 500 rpm. The DC power supply was started to control the current at 10 mA, and electrolysis was carried out for 4 h to obtain the target product p-tert-butylbenzaldehyde. The yield of the electrolysis product was analyzed by gas chromatography (GC), and the analysis method was the area normalization method. The product yield was 97%.

[0077] Example 24: Preparation of m-chlorobenzaldehyde (Formula (2-4)):

[0078] In a 50 mL diaphragmless electrolytic cell, 0.071 g of m-chlorobenzyl alcohol, 0.0159 g (5 mmol / L) of LiClO4, DBSA-doped polypyrrole gel electrolyte, 30 mL of solvent (acetonitrile) were added. The reaction temperature was 60 °C. Pt was used as the anode and Pb was used as the cathode. Then a stir bar with a size of 6 mm × 10 mm was added, and the magnetic stirring was set at 500 rpm. The DC power supply was started to control the current at 10 mA, and electrolysis was carried out for 4 h to obtain the target product m-chlorobenzaldehyde. The yield of the electrolysis product was analyzed by gas chromatography (GC), and the analysis method was the area normalization method. The product yield was 98%.

[0079] Example 25: Preparation of p-trifluoromethylbenzaldehyde (Formula (2-5)):

[0080] Add 0.088 g of p-(trifluoromethyl)benzyl alcohol, 0.0159 g (5 mmol / L) of LiClO4, 0.03 g of DBSA-doped polypyrrole gel electrolyte, 30 mL of solvent (acetonitrile) into a 50 mL diaphragmless electrolytic cell. The reaction temperature is 60 °C. Use Pt as the anode and Pb as the cathode. Then add a magnetic stir bar with a size of 6 mm × 10 mm. Set the magnetic stirring to 500 rpm. Start the DC power supply to control the current at 10 mA and electrolyze for 8 h to obtain the target product p-(trifluoromethyl)benzaldehyde. The yield of the electrolysis product is analyzed by gas chromatography (GC), and the analysis method is the area normalization method. The product yield is 91%.

[0081] It is easy for those skilled in the art to understand that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electrochemical conversion method of aromatic alcohol shown in formula (I) using polypyrrole gel electrolyte as a supporting electrolyte, characterized in that: The method for electrochemically converting aromatic alcohol sequentially comprises the following steps: Step 1: Mix an aromatic alcohol, a polypyrrole gel electrolyte, a conventional supporting electrolyte, and an organic solvent to form an electrolyte solution. In the electrolyte solution, the initial concentrations of the aromatic alcohol and the polypyrrole gel electrolyte are 1 - 13.8 g / L and 0.8 - 1.5 g / L respectively. Add the electrolyte solution into a diaphragmless electrolytic cell; the conventional supporting electrolyte is lithium perchlorate; Step 2: Place a cathode material and an anode material into the diaphragmless electrolytic cell; Step 3: Connect the cathode material and the anode material to a regulated DC power supply to carry out the electrochemically converting reaction of the aromatic alcohol to generate the aromatic aldehyde shown in formula (Ⅱ); Among them, the polypyrrole gel electrolyte is dodecylbenzenesulfonic acid, the anode material is a platinum sheet, so the cathode material is a lead sheet, and the initial concentration of the conventional supporting electrolyte in the electrolyte solution is 0.005 - 0.01 mol / L; Or the polypyrrole gel electrolyte is undoped or polypyrrole gel doped with sodium dodecylbenzenesulfonate or tartrazine, the anode material is a platinum sheet, the cathode material is a lead sheet, and the initial concentration of the conventional supporting electrolyte in the electrolyte solution is 0.01 mol / L; Or the polypyrrole gel electrolyte is polypyrrole gel doped with sodium dodecylbenzenesulfonate, dodecylbenzenesulfonic acid or tartrazine, the anode material is a carbon rod, the cathode material is a carbon rod, and the initial concentration of the conventional supporting electrolyte in the electrolyte solution is 0.005 mol / L; The reaction equation is as follows: In formula (Ⅰ) or (Ⅱ), R is an alkyl group of C1 - C4, an alkoxy group of C1 - C4, a C1 - C4 alkyl group substituted by a halogen, or a halogen.

2. The method for electrochemically converting aromatic alcohols according to claim 1, wherein: R is OCH3, CH3, t - Bu, Cl or CF3.

3. The method for electrochemically converting aromatic alcohols according to claim 1, characterized in that: The organic solvent is one of acetonitrile and N,N - dimethylformamide.

4. The method for electrochemically converting aromatic alcohol according to claim 1, wherein: In the electrolyte solution, the initial concentration of the polypyrrole gel electrolyte is 1 g / L.

5. The method for electrochemically converting aromatic alcohols according to claim 1, characterized in that: The electro - oxidation conversion reaction of the aromatic alcohol is carried out under stirring, the current magnitude is controlled at 5 - 40 mA, the reaction temperature is controlled at 30℃ - 70℃, the stirring rate is 100 rpm - 800 rpm, and the reaction time is 3 - 8 h.

6. The method for electrochemically converting aromatic alcohols according to claim 5, characterized in that: During the electrochemically converting reaction of the aromatic alcohol, the current magnitude is controlled at 5 - 20 mA; the reaction temperature is controlled at 50 - 70℃, and the stirring rate is 400 - 600 rpm.

7. The method for electrochemically converting aromatic alcohol according to claim 6, characterized in that: The electrochemically converting reaction of the aromatic alcohol is carried out under stirring, the current magnitude is controlled at 10 mA, the reaction temperature is controlled at 60℃, the stirring speed is 500 rpm, and the reaction time is 3 - 8 h.

Images