Preparation and properties of methylbis[1,2-bis(diphenylphosphino)ethane]cobalt(I)

Abstract

Reaction of cobalt(III) acetylacetonate with dimethylaluminum monoethoxide in the presence of 1,2-bis(diphenylphosphino)ethane (dpe) gives methylbis[1,2-bis(diphenylphosphino)ethane]cobalt(I), CoCH 3(dpe) 2 (I), which was characterized by elemental analysis, chemical reactions, IR and NMR spectra. The cobalt—carbon bond in I is cleaved by a protic acid with liberation of methane. The reaction of I with D 2 liberated CH 3D as a sole gaseous product and afforded CoD(dpe) 2. Insertion of carbon monoxide into the cobalt—carbon bond under mild conditions gave an acetylcobalt complex, Co(COCH 3)(CO) 2(dpe). sol1 2 Et 2O. Cobalt(I) acetylides, RCCCo(dpe) 2 (R = Me, Ph) were obtained by the reaction of I with RCCH.