THE CHEMISTRY OF η5-CpCo(CO)(maleoyl) AND η5-CpCo(CO)(phthaloyl) COMPLEXES

Article abstract of DOI:10.1016/0022-328X(85)87376-9

Insertion of η⁵-CpCo(CO)2 into dimethylcyclobutenedione and benzocyclobutenedione gave high yields of η⁵-CpCo(CO)(dimethylmaleoyl) and η⁵-CpCo(CO)(phthaloyl); respectively.Replacement of the carbon monoxide ligand in these complexes with thermally labile ligands (CH3CN, PhCN, C5H5N, (C2H5)2S) allowed a facile reaction with alkynes to occur.The maleoyl cobalt complex gave very high yields of stable η⁵-CpCo(CO)(benzoquinone) complexes which cleaved to the free quinones on treatment with cerium(IV).The phthaloylcobalt complex reacted to form unstable η⁵-CpCo(CO)(naphthoquinone) complexes and free naphthoquinones.