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Synthetic method of p-chlorobenzaldehyde

A technology for p-chlorobenzaldehyde and a synthesis method, which is applied in chemical instruments and methods, preparation of carbonyl compounds by hydrolysis, preparation of halogenated hydrocarbons, etc. good effect

Inactive Publication Date: 2015-03-25
CHANGSHU XINHUA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the total domestic production is less than 1000t / a, which is far from meeting the domestic market demand of more than 2500t / a

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] React p-chlorotoluene with fluorescent lamp and chlorine gas in the presence of phosphorus trichloride initiator (1wt%) to generate p-chlorobenzylidene dichloride, which is purified and catalyzed (catalyst dosage: 0.5wt%) and hydrolyzed for 6 hours to obtain p-chlorobenzaldehyde .

Embodiment 2

[0020] React p-chlorotoluene with fluorescent lamp and chlorine gas in the presence of phosphorus trichloride initiator (1.5wt%) to generate p-chlorobenzylidene dichloride, which is purified and catalyzed (catalyst dosage: 0.8wt%) for 12 hours to obtain p-chlorobenzene formaldehyde.

Embodiment 3

[0022] In the presence of phosphorus trichloride initiator (1.2wt%), p-chlorotoluene is irradiated by a tungsten lamp and reacted with chlorine gas to generate p-chlorobenzylidene dichloride, which is purified and catalyzed (catalyst dosage: 0.6wt%) and hydrolyzed for 8 hours to obtain p-chlorobenzylidene dichloride. Chlorobenzaldehyde.

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PUM

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Abstract

The invention discloses a synthetic method of p-chlorobenzaldehyde. The synthetic method comprises the following steps: performing illumination and chlorine reaction on p-chlorotoluene in the presence of a phosphorus trichloride initiator to generate p-chlorobenzal chloride, refining, and then performing catalytic hydrolysis for 6-12 hours to obtain p-chlorobenzaldehyde. The synthetic method of p-chlorobenzaldehyde, disclosed by the invention, is good in selectivity and high in yield.

Description

Technical field [0001] The invention belongs to the technical field of organic synthesis, and specifically relates to a synthesis method of p-chlorobenzaldehyde. [0002] Background technique [0003] p-Chlorobenzaldehyde is an important new pesticide, pharmaceutical, and dye intermediate. In medicine, p-chlorobenzaldehyde can be produced through condensation and cyclization reaction with mercaptopropionic acid. In terms of pesticides, p-chlorobenzaldehyde is used to synthesize the herbicide Maidisan, plant growth regulators paclobutrazol and Uniconazole, etc. In terms of dyes, p-chlorobenzaldehyde is used to synthesize acid blue 7BF, acid brilliant blue 6B, etc. [0004] The country that produces p-chlorobenzaldehyde abroad is mainly the United States, which is at the leading level in process technology development and has achieved industrial production. Although the research and development of p-chlorobenzaldehyde in my country started late, it has developed rapidly in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C47/55C07C45/43
CPCC07C17/14C07C45/43C07C47/55C07C25/02
Inventor 窦建华陆志忠徐俊德
Owner CHANGSHU XINHUA CHEM