Pyrrolidinylcyclopropenyl cations 1a,b in alkaline solution at room temperature are converted efficiently into (Z)-and (E)-α,β-unsaturated amides 3 and 4, respectively, with more electron-donating alkylsulfanyl groups at the β-position.
Y. Yagyu, N. Matsumura, H. Tanaka, Z. Maeda and H. Inoue, J. Chem. Soc., Perkin Trans. 1, 1996, 117 DOI: 10.1039/P19960000117
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