Rearrangements of 3-aryl-substituted cyclopropenyl anions and the gas-phase acidity of 3-(4-Methylphenyl)cyclopropene

K. M. Broadus, S. Han, Steven R Kass

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15 Scopus citations

Abstract

3-(4-Methylphenyl)-3-trimethylsilylcyclopropene and 3-(4-trifluoromethylphenyl)-3-trimethylsilylcyclopropene react with fluoride ion in the gas phase to afford 6-substituted 3-indenyl anions via a spontaneous rearrangement of their corresponding cyclopropenyl anions. These isomerizations led us to reinvestigate the reported gas-phase generation of 1,2,3-triphenylcyclopropenyl anion, and contrary to the previous study, a similar rearrangement to 1,2-diphenyl-1-indenyl anion is observed. Despite the instability of 3-aryl-3-cyclopropenyl anions, we were able to measure the acidity of 3-(4-methylphenyl)cyclopropene at the allylic position (δH°acid = 398.6 ± 1.4 kcal/mol) by the DePuy kinetic method. Ab initio calculations on the structures and energies of mono- and triaryl-substituted cyclopropenyl anions also are presented.

Original languageEnglish (US)
Pages (from-to)99-106
Number of pages8
JournalJournal of Organic Chemistry
Volume66
Issue number1
DOIs
StatePublished - Jan 12 2001

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