A convenient method has been developed for the synthesis of substituted cyclopentadienes, starting from allylidene triphenylphosphoranes and α-halocarbonyl compounds, via a [3 + 2] annulation process.
M. Hatanaka, Y. Himeda and I. Ueda, J. Chem. Soc., Chem. Commun., 1990, 526 DOI: 10.1039/C39900000526
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