Mass spectrometry in structural and stereochemical problems. CXXXVII. Examples of interaction of remote functional groups after electron impact

Mark M. Green, Carl Djerassi

Research output: Contribution to journalArticle

Abstract

Oxygen rearrangement on electron impact has been found to be an important fragmentation pathway in various (I-VII) cyclic ketones containing methoxyl and hydroxyl groups. This oxygen migration, which produces, for example, the m/e 60 ion (C 2H 4O 2) from the molecular ion of 4-hydroxycyclohexanone (II), occurs in six-and seven-membered rings, with the two functional groups in both a 1,3 and 1,4 relationship. Heavy substitution around the ketone group appears to enhance the rearrangement while substitution adjacent to the hydroxyl or methoxyl group acts as a depressant. Deuterium labeling of 4-methoxy- and 4-hydroxycyclohexanone (I and II) suggested the intermediacy of the molecular ion of methyl Δ 5-hexenoate (XIII) in the case of 4-methoxycyclohexanone (I) and support for this proposal was provided by the synthesis of XIIL The rearrangement has been found to be unimportant in acyclic ketones containing primary methyl ether groups.

Original languageEnglish (US)
Pages (from-to)5190-5198
Number of pages9
JournalJournal of the American Chemical Society
Volume89
Issue number20
StatePublished - 1967

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Ketones
Functional groups
Mass spectrometry
Mass Spectrometry
Electrons
Ions
Hydroxyl Radical
Substitution reactions
Oxygen
Methyl Ethers
Deuterium
Labeling
Ethers

ASJC Scopus subject areas

  • Chemistry(all)

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Mass spectrometry in structural and stereochemical problems. CXXXVII. Examples of interaction of remote functional groups after electron impact. / Green, Mark M.; Djerassi, Carl.

In: Journal of the American Chemical Society, Vol. 89, No. 20, 1967, p. 5190-5198.

Research output: Contribution to journalArticle

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