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New reactions of N-T-butyl-N-benzoylhydrazine with triphosgene

✍ Scribed by Wang Qing-Min; Cheng Jun-Ran; Huang Run-Qiu

Book ID
102339985
Publisher
Journal of Heterocyclic Chemistry
Year
2003
Tongue
English
Weight
30 KB
Volume
40
Category
Article
ISSN
0022-152X

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✦ Synopsis

Abstract

N‐tert‐Butyl‐N‐benzoylhydrazine was prepared in a new and convenient procedure with good yield. Triphosgene underwent reaction with three equivalents of N‐t‐butyl‐N‐benzoylhydrazine using six equivalents of triethylamine as a base to yield the cyclic tetramer of N‐t‐butyl‐N‐isocyanatobenzoylamide. Treatment of triphosgene with three equivalents of N‐t‐butyl‐N‐benzoylhydrazine either in the presence of three equivalents of triethylamine or in the absence of triethylamine afforded the cyclic pentamer of iso‐cyanate, from which tert‐butyl is eliminated.

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