Process for preparing disalts of 3,4-dimercaptoisothiazole-5-car

Details Process for preparing disalts of 3,4-dimercaptoisothiazole-5-car Process for preparing disalts of 3,4-dimercaptoisothiazole-5-car

1977-04-25

1978-08-29

Daus, Donald G.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07D27502

Patent

active

041103351

ABSTRACT:
Described is a process for preparing 3,4-dimercaptoisothiazole-5-carbonitrile disalt, preferably disodium salt, and its conversion to 1,4-dithiino[2,3-c; 6,5-c']-diisothiazole-3,7-dicarbonitrile through an intermediate dimeric structure believed to be [1,2,5,6]tetrathiocino-[3,4-c; 7,8-c']diisothiazole-3,8-dicarbonitrile. 3,4-Dimercaptoisothiazole-5-carbonitrile disodium salt and [1,2,5,6]tetrathiocino[3,4-c; 7,8-c']diisothiazole-3,8-dicarbonitrile are useful rubber curing agents, and 1,4-dithiino[2,3-c; 6,5-c']diisothiazole-3,7-dicarbonitrile is the immediate precursor of 1,4-dithiino[2,3-c; 6,5-c']diisothiazole-3,7-dicarboxylic acid, a yellow pigment.

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