Formation of alkenyl ketone complexes and of dimeric .alpha.,.beta.-butenolides by sequential insertion of phenylacetylene and carbon monoxide into nickel-acyl bonds. X-ray structures of Ni[C(Ph) = C(H)(COCH2SiMe3)]Cl(PMe3)2 and Ni[C(Ph)(PMe3)C(H)(COCH2CMe2Ph)]Cl(PMe3)

Abstract
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