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Extensive substituent scrambling in substituted diphenylacetylenes on electron impact

✍ Scribed by D. V. Ramana; N. V. S. Rama Krishna

Publisher
John Wiley and Sons
Year
1989
Tongue
English
Weight
424 KB
Volume
24
Category
Article
ISSN
1076-5174

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✦ Synopsis

Extensive randomization of the substituents is found in mono-and disubstituted diphenylacetylenes under electron impact conditions. The study of diphenylacetylenes with a variety of substituents indicates that the electronwithdrawing groups favour the substituent scrambling. All the substituted diphenylacetylenes give an ion at m/z 176, having a common ion-structure, arising as a result of the expulsion of a hydrogen radical and the substituent in monosubstituted diphenylacetylenes and the expulsion of both the substituents in disubstituted diphenylacetylenes. A ring-expanded structure is postulated for this common fragment.

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