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Method for preparing 2,4-diphenyl-4-methyl-1-amylene in ion liquid [Hmim]+BF4-

An ionic liquid and diphenyl technology, which is applied in the field of organic compound preparation, can solve the problems that environment, yield and selectivity cannot be excellent at the same time, and achieve the effects of high selectivity, simple process and high yield selectivity.

Inactive Publication Date: 2004-09-01
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of 2,4-diphenyl-4-methyl-1-pentene in ionic liquid is an effective way to solve the existing problems in the background technology, that is, the environment, yield and selectivity cannot be all excellent at the same time

Method used

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  • Method for preparing 2,4-diphenyl-4-methyl-1-amylene in ion liquid [Hmim]+BF4-

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: 80g ionic liquid [Hmim] + BF 4 - Mix with 14g of α-methylstyrene, under normal pressure, 60°C and strong stirring, dimerize for 8.5 hours, stop stirring; cool the reaction solution to room temperature, the product and the ionic liquid are automatically separated, and the upper layer is separated The product does not need to be refined, and the yield is 98%. The 2,4-diphenyl-4-methyl-1-pentene content in the product is 95.8%. The ionic liquid in the lower layer can be directly recycled after separation.

Embodiment 2

[0023] Embodiment 2: 80g ionic liquid [Hmim] + BF 4 - Mix with 14g of α-methylstyrene, under normal pressure, 50°C and strong stirring, dimerize for 13 hours, stop stirring; cool the reaction solution to room temperature, the product and the ionic liquid are automatically separated, and the upper layer is separated The product does not need to be refined, and the yield is 82%. The 2,4-diphenyl-4-methyl-1-pentene content in the product is 95.3%. The ionic liquid separated from the lower layer can be directly recycled.

Embodiment 3

[0024] Embodiment 3: 80g ionic liquid [Hmim] + BF 4 - Mix with 14g of α-methylstyrene, under normal pressure, 80°C and strong stirring, dimerize for 1 hour, stop stirring; cool the reaction solution to room temperature, the product and the ionic liquid are automatically separated, and the upper layer is separated The product does not need to be refined, and the yield is 94%. The 2,4-diphenyl-4-methyl-1-pentene content in the product is 86.1%. The ionic liquid separated from the lower layer can be directly recycled.

[0025] The invention is particularly suitable for preparing 2,4-diphenyl-4-methyl-1-pentene with high yield and high selectivity, is suitable for laboratory preparation and industrial scale production, and realizes clean production. This product can be used as an environmentally friendly chain transfer agent or chain terminator in free radical polymerization, and can also be used as a polymer modifier, especially suitable for ABS resin, SAN resin, polyethylene, ...

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Abstract

The present ivnention belongs to the field of organic compound preparing technology. Inside ion liquid [Hmin]+BF4-, or methyl imidazole tetrafluoroborate, use as both solvent and catalyst, alpha-methyl styrene is made to pass through polymerization, gravity deposition and separation to produce 2,4-diphenyl-4-methyl-1-amylene product. The present invention has the advantags of very simple technological process, high yield and selectivity. The product is suitable for use in the production of ABS resin, SAN resin, polyethylene, polystyrene and other polymers.

Description

technical field [0001] The present invention relates to a kind of in ionic liquid [Hmim] + BF 4 - , that is, a method for preparing 2,4-diphenyl-4-methyl-1-pentene from methylimidazolium tetrafluoroborate, which belongs to the technical field of organic compound preparation. [0002] and [0003] Respectively [Hmim] + BF 4 - and 2,4-diphenyl-4-methyl-1-pentene structure. Background technique [0004] The unsaturated dimer of α-methylstyrene-2,4-diphenyl-4-methyl-1-pentene has important uses in the polymer manufacturing industry. The dimer can be used as an environmentally friendly chain transfer agent or chain terminator in free radical polymerization, and can also be used as a polymer modifier. It has been widely used in ABS resin, SAN resin, polyethylene, polystyrene, etc. Production of polymers. [0005] Most of the existing methods for preparing 2,4-diphenyl-4-methyl-1-pentene use acidic substances or transition metal compounds as catal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C2/04C07C15/50
Inventor 邹刚张鹏荣杨帆汤杰何鸣元
Owner EAST CHINA NORMAL UNIV