Preparation of ortho-sulfobenzoic acid anhydride by catalyzed th

Details Preparation of ortho-sulfobenzoic acid anhydride by catalyzed th Preparation of ortho-sulfobenzoic acid anhydride by catalyzed th

1982-05-26

1983-10-04

Raymond, Richard

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D32704

Patent

active

044080581

ABSTRACT:
This invention relates to a process for the synthesis of ortho-sulfobenzoic acid anhydride which comprises heating a 2-sulfohalide benzoate in the presence of a catalytic amount of a Friedel-Crafts catalyst. Especially preferred in the practice of this invention is the reaction of ortho-carbomethoxybenzenesulfonyl chloride in the presence of a zinc or iron halide to produce ortho-sulfobenzoic acid anhydride.

REFERENCES:
patent: 4042600 (1977-07-01), DiPippo
patent: 4259499 (1981-03-01), DiPippo
Friedel-Crafts and Related Reactions, vol. 3, G. Olah, pp. 1319-1347.

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