Abstract

Virtually all alkynes react smoothly and under mild conditions with octacarbonyldicobalt to yield complexes of the type (1). When treated with alkenes such complexes react to give cyclopentenone derivatives (2), a reaction which we call “Khand reaction” after my late coworker Dr. I. U. Khand, who not only first observed this transformation, but also subjected it to systematic study.

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