Process for producing isatoic anhydrides

Details Process for producing isatoic anhydrides Process for producing isatoic anhydrides

1996-12-26

1998-08-18

Daus, Donald G.

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

Organic compounds

Chalcogen in the nitrogen containing substituent

C07D26514

Patent

active

057959846

ABSTRACT:
A process for producing isatoic anhydrides of the formula (II): ##STR1## which comprises reacting an anthranilic acid of formula (I): ##STR2## or a salt thereof with phosgene using a mixed solvent of water and an organic solvent miscible with water and inert to the reaction; conducting the reaction in the coexistence of an alkylpyridinium salt in an aqueous solvent; or using a mixed solvent of water and a specific amount of an organic solvent substantially immiscible with water and inert to the reaction.

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patent: 4883800 (1989-11-01), Hashimoto et al.
S.M. Gadekar et al., "Some Halogenated 1,2,3-Benzotriazin-4(3H)ones", The Journal of Organic Chemistry, vol. 26, No. 2, Feb. 24, 1961, pp. 613-615.

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