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US 4,307,236 AGranted
Process for the preparation of dithiazole-disulfides
AssigneeAkzona Incorporated
InventorsHans Zengel, Manfred Bergfeld, Ludwig Eisenhuth
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Abstract
This disclosure relates to a novel process for preparing a class of dithiazolyl-(2,2')-disulfides by the catalytic oxidation of 2-mercaptothiazoles. In particular the present invention involves a process for preparing dibenzothiazyl-disulfides upon the oxidation of a 2-mercaptobenzothiazole in the presence of a tertiary amine.
Claims7
A process for preparing a compound of the formula:
- ##STR4## wherein R and R' are independently selected from the group consisting of hydrogen, halogen, nitro, hydroxyl and substituted C.sub.1 -C.sub.6 alkyl, C.sub.1 -C.sub.6 alkoxy, C.sub.6 -C.sub.12 cycloalkyl or C.sub.6 -C.sub.12 aryl containing one or more substituents selected from the class consisting of halogen, nitro, C.sub.1 -C.sub.5 alkyl and C.sub.1 -C.sub.5 alkoxy;
- or R and R' jointly may form the substituent ##STR5## whereby R", R'", R'"' and R'"" are independently selected from the groups represented by R and R', which comprises catalytically oxidizing a 2-mercaptothiazole of the general formula ##STR6## utilizing oxygen, or a gas containing oxygen, in the presence of a solvent at temperatures in a range from 0.degree. C. to 150.degree. C., in the presence of a tertiary amine catalyst.
Dependencies are inferred from the claim text.