A high-level ab initio and density functional investigation of cyclopropenyl anion and its mono-, di-, and trisubstituted derivatives

Grant N. Merrill, Steven R. Kass

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28 Scopus citations

Abstract

High-level ab initio and density functional theory calculations were carried out on cyclopropenyl anion (1) and related species. The parent c- C3H3- ion is predicted to be unstable with respect to electron loss whereas its cyano-substituted derivatives are attractive synthetic targets. MCSCF structures for singlet and triplet cyclopropenyl anion are reported and contrasted to the results obtained from more modest computations. Energetic quantities for 1 were computed including its proton affinity, destabilization energy, singlet-triplet gap, electron binding energy, and ring-opening isomerization energy. The allylic C-H bond strength for cyclopropene also is given. Mono-, di-, and tricyanocyclopropenyl anions were investigated too, and their conjugate acids have lower pK(a)'s than cyclopropene by up to 70.4 kcal/mol or 52 pK(a) units.

Original languageEnglish (US)
Pages (from-to)12322-12337
Number of pages16
JournalJournal of the American Chemical Society
Volume119
Issue number50
DOIs
StatePublished - Dec 17 1997

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