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A kind of preparation method of 2-(4-chlorophenethyl)-2-tert-butyl oxirane

A technology of tert-butyl oxirane and chlorophenethyl is applied in the field of preparation of 2--2-tert-butyl oxirane, can solve the problems of long production cycle, high boiling point of toluene, difficult precipitation and the like, and achieves the production cycle Shortening, low boiling point, low solvent consumption effect

Inactive Publication Date: 2011-12-14
NANTONG PAISIDI PESTICIDE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The traditional production process of this product uses toluene as a solvent. The disadvantage is that toluene has a high boiling point, is not easy to desolventize, and has a long production cycle.

Method used

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  • A kind of preparation method of 2-(4-chlorophenethyl)-2-tert-butyl oxirane
  • A kind of preparation method of 2-(4-chlorophenethyl)-2-tert-butyl oxirane

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preparation example Construction

[0012] The preparation method of 2-(4-chlorophenethyl)-2-tert-butyl oxirane of the present invention, concrete technique is as follows: by 4,4-dimethyl-1-(4-chlorophenyl)-3- Pentanone, dimethyl sulfide, and dimethyl sulfate are produced by methylation reaction under potassium carbonate alkaline conditions. The specific steps are: first, dimethyl sulfide and dimethyl sulfate are at 20-30°C Synthesize the salt, and then react the generated salt with 4,4-dimethyl-1-(4-chlorophenyl)-3-pentanone at 30-40°C to generate 2-(4-chlorophenethyl)- 2-tert-butyloxirane, and at the same time, dimethyl sulfide is released. Its reaction formula is as shown in the accompanying drawing.

[0013] The molar ratio of raw materials in a chemical reaction:

[0014] 4,4-Dimethyl-1-(4-chlorophenyl)-3-pentanone: dimethyl sulfide: dimethyl sulfate: KOH = 1: 1.2-2.0: 1.1-1.8: 1.2-2.0.

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Abstract

The invention discloses a preparation method of 2-(4-chlorophenethyl)-2-tert-butyl oxirane, which is characterized in that: the 2-(4-chlorophenethyl)-2-tert-butyl oxirane Ethane is produced by the methylation reaction of 4,4-dimethyl-1-(4-chlorophenyl)-3-pentanone, dimethyl sulfide, and dimethyl sulfate under alkaline conditions; The steps are: first, dimethyl sulfide and dimethyl sulfate are synthesized into salt at 20-30°C, and then the resulting salt is combined with 4,4-dimethyl-1-(4-chlorobenzene)-3 - Pentanone reacts at 30-40°C to generate 2-(4-chlorophenethyl)-2-tert-butyloxirane, and at the same time, dimethyl sulfide is released. The invention has the advantages of: using dimethyl sulfide as a solvent has a low boiling point of sulfide, is easy to desolventize, can be recycled repeatedly, consumes little solvent, greatly shortens the production cycle, and improves production efficiency.

Description

technical field [0001] The invention relates to a preparation method of 2-(4-chlorophenethyl)-2-tert-butyloxirane. Background technique [0002] 2-(4-Chlorophenethyl)-2-tert-butyloxirane is an intermediate in the production of tebuconazole. [0003] Physical and chemical properties: [0004] Colorless or light yellow liquid, density greater than 1 (95%), insoluble in water, easily soluble in organic solvents (such as toluene, dimethyl sulfide, etc.), molecular weight 238.5, unstable under acidic conditions, easy to decompose. [0005] The traditional production process of this product uses toluene as a solvent. The disadvantage is that toluene has a high boiling point, is not easy to desolventize, and has a long production cycle. Contents of the invention [0006] Main task of the present invention is to provide a kind of preparation method of 2-(4-chlorophenethyl)-2-tert-butyl oxirane, specifically the 2-( The preparation method of 4-chlorophenethyl)-2-tert-butyl oxira...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D303/08C07D301/02
Inventor 田昌明
Owner NANTONG PAISIDI PESTICIDE CHEM