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Reaction of metallo S-alkyl N-cyanodithioiminocarbonates and alkyl N-cyanocarbamates with hydrazine. A novel preparation of 5-amino-3-mercapto-1,2,4-triazole

✍ Scribed by Lyndon K. Marble; Wallace E. Puckett; William Russell Summers

Publisher: Journal of Heterocyclic Chemistry
Year: 1998
Tongue: English
Weight: 496 KB
Volume: 35
Category: Article
ISSN: 0022-152X
DOI: 10.1002/jhet.5570350408

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✦ Synopsis

Abstract

Metal salts of S‐alkyl‐N‐cyanodithioiminocarbonates 7 react as electrophiles with hydrazine hydrate to form 5‐amino‐3‐mercapto‐1__H__‐1,2,4‐triazole 1. The novel 4‐cyanothiosemicarbazide 9 is proposed as the intermediate which cyclizes to the aromatic triazole. The rate determining step is addition of hydrazine to the iminocarbonate and is second order. Other nucleophiles such as substituted hydrazines and amines failed to react. Exchange of either or both sulfurs with oxygen leads to decomposition or mixtures of products.

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