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Preparation method of cyclic carbonate

A technology of cyclic carbonates and epoxides, which is applied in the direction of organic chemistry, can solve the problems of many factors affecting the reaction results, and achieve the effects of excellent reusability, convenient operation, and simple catalytic system

Active Publication Date: 2013-09-25
SUN YAT SEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although the binary catalytic system has achieved good

Method used

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  • Preparation method of cyclic carbonate
  • Preparation method of cyclic carbonate
  • Preparation method of cyclic carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In a 10 mL stainless steel autoclave, add 0.03 mmol of catalyst (M=Al, R in the general formula (I) 1 =-CH 2 CH 2 -, R 2 = H, R 3 =Me, X=Cl, Y=Cl) and 6 mmol styrene oxide, charged with 1 MPa of carbon dioxide, and stirred at 100°C for 8 h. After the reaction, ethyl acetate was added, and the catalyst was recovered by centrifugation. , and the supernatant was dried in vacuum in addition to the solvent to obtain styrene cyclic carbonate (purity>98%), and the yield was 85%.

[0021]

Embodiment 2

[0023] In a 10 mL stainless steel autoclave, add 0.006 mmol of catalyst (M=Al, R in the general formula (I) 1 =-CH 2 CH 2 -, R 2 = H, R 3 =(CH 2 CH 2 O) n CH 3 , X=Cl, Y=Cl) and 6 mmol allyl glycidyl ether, charged with 1 MPa of carbon dioxide, and stirred at 100°C for 2 h. After the reaction, diethyl ether was added, and the catalyst was recovered by centrifugation. The supernatant was vacuum-dried in addition to the solvent to obtain the corresponding cyclic carbonate (purity>99%) with a yield of 99%.

[0024]

Embodiment 3

[0026] In the 10 mL stainless steel autoclave, add the catalyst of 0.015 mmol (M=Zn in the general formula (I), R 1 =-CH 2 CH 2 -, R 2 = H, R 3 =(CH 2 CH 2 O) n CH 3 , X=Cl, Y=Cl) and 6 mmol 1,2-epoxyoctane, charged with 1 MPa of carbon dioxide, stirred at 100°C for 10 h, after the reaction, added dichloromethane, centrifuged The catalyst was separated and recovered, and the supernatant liquid was vacuum-dried to obtain the corresponding cyclic carbonate (purity>95%) with a yield of 95%.

[0027]

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Abstract

The invention discloses a preparation method of cyclic carbonate. The cyclic carbonate can be effectively and selectively synthesized from epoxide and carbon dioxide under the catalysis effect of a polyether chain containing imidazolium-based ionic liquid modified salen metal complex on the condition with the pressure of 0.1-5.0MPa and the temperature of 40-150 DEG C. The reaction conditions in the process are relatively mild, no solvent or other adjuvants need to be added, and reaction time is short; and in addition, the catalyst used in the preparation method disclosed by the invention can form a homogeneous phase catalyst system, can be conveniently separated from the reaction system by adding a solvent, and can be repeatedly used.

Description

technical field [0001] The invention relates to a preparation method of a cyclic carbonate, in particular to a method for preparing a cyclic carbonate by catalyzing carbon dioxide and epoxide cycloaddition with a salen metal complex. Background technique [0002] With the intensification of the global "greenhouse effect" and the energy crisis, CO 2 As a rich, non-toxic and cheap C1 starting material, it has attracted extensive attention from scientific researchers. Among them, catalyzing the reaction of carbon dioxide and epoxy compounds to synthesize cyclic carbonates is a low-pollution, environmentally friendly and high-atom-utilization technical route. Cyclic carbonates are widely used in the fields of pesticides, medicines, resins, dyes, coatings, electronic chemicals, food additives and solvents. They are important fine chemical intermediates and organic solvents with excellent performance. [0003] At present, researchers have developed a series of catalysts that can...

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Application Information

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IPC IPC(8): C07D317/38
Inventor 纪红兵罗荣昌周贤太
Owner SUN YAT SEN UNIV