Abstract

The carbene carbon of 1,4-alkene and -alkyne carbene complexes of chromium and tungsten (1 and 2) reacts with nucleophiles such as hydrides originating from dihydropyridine and methyllithium to give upon CO and alkyne (or alkene) insertions polycyclic lactones 6 and 7, cyclopentanones 10 and 11, and cyclopentanols 12.

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