Synthesis of 1-Aryl-2-Vinyl Cyclopropanes by Intramolecular Carbolithiation
摘要:
Benzylselenides bearing a gamma-alkenyl-epsilon-sulfonyloxy side chain react with butyllithiums to produce, via the corresponding benzyllithiums, 1-aryl-2-vinyl cyclopropanes. (C) 1997 Published by Elsevier Science Ltd.
Homoallyl−Cyclopropylcarbinyl Cation Manifold. Trimethylsilyl versus Aryl Stabilization
作者:Xavier Creary、Benjamin D. O'Donnel、Marie Vervaeke
DOI:10.1021/jo062668n
日期:2007.4.1
E-trifluoroacetate (p-CH3) along with the E-substitution product. This isomerization suggests that the cyclized β-silyl cation can isomerize and then reopen to a classical aryl-stabilized cation. By way of contrast, B3LYP/6-31G* computational studies show only cyclized β-silyl cations as energy minima. Open kC cations are higher-energy nonminimum energy structures.