2-Alylsubstituted pentacarbonyl {[2-(dibenzylamino]ethoxycarbene} chromium complexes 3a,b react with diphenylethyne 4, but 2-yne 5, or cyclooctne 6, to give 5-(dibenzylaminomethylene)-4-ethoxy-w-cyclopentenones 8a,b, 9a, 10a, and 10b in good yields (59–78%).
M. Duetsch, S. Cidioni, F. Stein, F. Funke, M. Noltemeyer and A. de Meijere, J. Chem. Soc., Chem. Commun., 1994, 1679 DOI: 10.1039/C39940001679
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