Cobalt metallocycles : I. One-step and stepwise synthesis of cobaltacyclopentadiene complexes from acetylenes

Abstract

(π-Cyclopentadienyl) (triphenylphosphine) cobaltacyclopentadiene complexes having a variety of substituents have been prepared from substituted acetylenes and (π-cyclopentadienyl)bis(triphenylphosphine)cobalt. In some cases monoacetylene complexes have been isolated and by addition of other acetylenes to the monoacetylene complexes, cobalt metallocycles consisting of two diffferent acetylene units have been prepared. The structures of all cobaltacyclopentadiene isomers have been determined by NMR spectra and/or by degradation to organic compounds.