Structure of fac-tricarbonyl(tert-butylethynyl)[ethylenebis(diphenylphosphine)]manganese(I)

Stepwise Formation of σ-Alkynyl, Vinylidene, and Vinylphosphonium Complexes of Manganese(I)

“…The solid-state molecular structure of 3 was determined by X-ray analysis (Figure ). The crystal structure reveales the presence of the alkynyl ligand, with C6−C7 (1.208(2) Å) and Mn−C7 (1.9801(16) Å) bond lengths typical of a triple and single bond, respectively . It is worth remarking that formation of 3 as described above represents a rare synthetic approach for σ-alkynyl derivatives from a terminal alkyne and a complex containing the deprotonating agent as a ligand (diphosphinomethanide), which remains attached to the metal after proton abstraction (dppm).…”