The chemistry of metallacyclic alkenylcarbene complexes Part 9. Synthesis and reactions of chelated #eta#~2-alkene- and #eta#~3-allyl-carbene complexes of cobalt, manganese and chromium

摘要

Cobaltalactams 7 with alkyl substituents at the nitrogen atom are accessible by UV-irradiation of CpCo(CO)_2 6 in the presence of the appropriate vicinal aminoalkenol 8. Thus chelated (#eta#~3-allyl)cobaltcarbene complexes with either (endo-amino)oxo (3), (exo-amino)oxo (11), or dioxo (2) substitution at the carbene carbon atom are now available. A synthetic route to chelated (#eta#~2-alkene)-carbene complexes of chromium with allylically situated hydroxy groups is also presented.