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Title:
PRODUCTION OF PHTHALIDE
Document Type and Number:
Japanese Patent JPS62480
Kind Code:
A
Abstract:

PURPOSE: To obtain phthalides in high selectivity without formation of bischloromethylether as a by-product, by reacting a corresponding specific trialkoxybenzoic acid with formaldehyde in the presence of sulfuric acid or an organic sulfonic acid.

CONSTITUTION: A trialkoxybenzoic acid expressed by formula I (R1, R2 and R3 represent 1W6C lower alkyl) is reacted with formaldehyde in the presence of sulfuric acid or an organic sulfonic acid (methane sulfonic acid, etc.) to obtain phthalides expressed by formula II. The reaction is carried out by using 2W60mol, based on 1mol trialkoxybenzoic acid, formaldehyde and setting a concentration of the sulfuric acid or the organic sulfonic acid at 1W40wt% and reaction temperature at 50W120°C.


Inventors:
TANIGUCHI SEIRO
MORITA YOSHIMI
HAYAKAWA SHUZO
KAWASHIMA OSAMU
Application Number:
JP13939185A
Publication Date:
January 06, 1987
Filing Date:
June 26, 1985
Export Citation:
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Assignee:
MITSUBISHI CHEM IND
International Classes:
C07D307/88; (IPC1-7): C07D307/88
Foreign References:
US4213996A1980-07-22
Attorney, Agent or Firm:
Hajime Hasegawa



 
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