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Cycloreversal reaction and ortho interactions in 2-aryl-4H-3, 1-benzoxazin-4-ones on electron impact

✍ Scribed by D. V. Ramana; E. Kantharaj

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
342 KB
Volume
30
Category
Article
ISSN
1076-5174

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✦ Synopsis

Abstract

A cycloreversal reaction, leading to aroyl cations, is the major process in 2‐aryl‐4__H__‐3,1‐benzoxazin‐4‐ones under electron impact conditions. The ortho interaction of the methoxy and the nitro groups in the 2‐phenyl moieties in these compounds present the most abundant ions at m/z 119 and 134, respectively, in their mass spectra as a result of the transfer of a hydrogen atom from the former and an oxygen atom from the latter to the imine nitrogen of the heterocycle. The ion structures and the mechanisms for the proposed fragmentations are based on high‐resolution data, B/E and B^2^/E linked‐scan spectra, collision‐activated decomposition–B‐/E linked‐scan spectra and deuterium labelling.

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