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The mass spectra of substituted 2-methylbenzophenones

✍ Scribed by James Grimshaw; Charles S. Sell; Reginald J. Haslett

Publisher: John Wiley and Sons
Year: 1974
Tongue: English
Weight: 288 KB
Volume: 8
Category: Article
ISSN: 1076-5174
DOI: 10.1002/oms.1210080141

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✦ Synopsis

Abstract

The mass spectra of some methoxy and methyl derivatives of 2‐methylbenzophenone have been examined. Loss of a substituents from 3′‐and 4′‐positions as well as the previously known loss from 2′‐positions are important fragmentation processes. Thus, these fragmentations are of little use in locating substituents on benzophenones of unknown structure. Deuterium labelling shows the [M ‐ 1]^+^ ion from 3′,4,4′,5,5′‐pentamethoxy‐2‐methyl benzophenone to be due largely to loss of hydrogen from 2′‐ and 6′‐positions.

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