. alpha.-Carbonyl carbocations. 4. NMR detection and reactivities of diaryl. alpha.-carbonyl cations

LH Dao, M Maleki, AC Hopkinson…

Index: Dao,L.H.; Malecki,M.; Hopkinson,A.C. Journal of the American Chemical Society, 1986 , vol. 108, p. 5237

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Citation Number: 30

Abstract

Abstract: Diaryl a-carbonyl carbocations 6 were generated from their alcohol precursors in strong acid conditions at low temperatures. The assignments of the low-field signals were obtained from specifically" C-labeled precursors. At ambient temperatures these ions undergo 6a-electrocyclization to give benzofurans or fluorene, the particular transformation depending on the nature of the carbonyl substituent. The decomposition of these ions ...