Friedel–crafts acetylation products of (η-cyclopentadienyl)[η-(3)-1,2-dicarbaundecaborane(11)]cobalt and their molecular structures

Abstract

Friedel–Crafts acetylation of [(cp)Co{η-(3)-1,2-B₉C₂H₁₁}] with aluminium chloride in carbon disulphide results in the formation of [(cp)Co{η-(3)-1,2-B₉C₂H₁₀Cl}], (I), [(cp)Co{η-(3)-1,2-B₉C₂H₁₀(8-OCOMe)}], (II), [(cp)Co{η-(3)-1,2-B₉C₂H₁₀(8-OH)}], (III), and [(cp)Co{η-(3)-1,2-B₉C₂H₁₀(8-COMe)}], (IV)(cp =η-cyclo-pentadienyl). The complexes have been characterized by i.r., n.m.r., and mass-spectral measurements. X-Ray structure analyses of (II) and (IV) have been made and the substituents are bonded to B(8). Possible mechanisms for the production of these complexes are described.