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The mass spectra of intramolecularly hydrogen bonded 2(1H)-quinoxalinone and 2H-1,4-benzoxazin-2-one

✍ Scribed by Takeshi Inagaki; Yasuo Iwanami

Publisher
John Wiley and Sons
Year
1977
Tongue
English
Weight
258 KB
Volume
12
Category
Article
ISSN
1076-5174

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✦ Synopsis

Abstract

The mass spectra of those 3‐phenacyl derivatives of 2(1__H__)‐quinoxalinone and 2__H__‐1,4‐benzoxazin‐2‐one with an intramolecular hydrogen bonding showd that: (1) the primary elimination of the shole sidchain is reduced as compared with an unchelated derivative; (2) the importan t fragmentation routes in the quinoxalinone series are ring cleavage with loss of CO followed by recyclization and expulsion of a hydrogen atom, and this can also occur in the reverse order; (3) this reverse process is virtually absent in the benzoxazinone series. Finally, the doubly charged molecular ions appear to undergo an analogous decomposition giving fairly intense [M‐CO]^2+^ or [M‐(CO+H or CI]^2+^ ions.

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