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Australian Journal of Chemistry Australian Journal of Chemistry Society
An international journal for chemical science
RESEARCH ARTICLE

The rearrangement of heteroaryl nitrenes formed by pyrolysis of fused oxadiazolones at 600°C

RFC Brown and RJ Smith

Australian Journal of Chemistry 25(3) 607 - 624
Published: 1972

Abstract

Heteroaryl nitrenes were formed by pyrolysis of the corresponding ring-fused oxadiazolones at 600°/0.1-0.5 mm with short contact times. 2-Pyridyl and 3-iso-quinolyl nitrenes rearranged predominantly by ring contraction to give cyano-pyrroles and 1-cyanoisoindole, respectively. 2-Quinolyl and 1-isoquinolyl nitrenes underwent ring fission followed by rearrangements which led to O-cyanophenyl-acetonitrile and 4-cyanoindole. 2-Benzo[f]quinolyl nitrene rearranged predominantly by ring fission, but some ring contraction also occurred. The rearrangement of 2-quinolyl nitrene has been investigated by using 14C and 15N labelling. The dominance of ring contraction or ring fission reactions is rationalized in terms of the effect on the whole π-system of the localization of π-electrons in an electrocyclic transition state for ring contraction.

https://doi.org/10.1071/CH9720607

© CSIRO 1972

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