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Salicylaldehyde derivatives and related β-hydroxo aldehydes CHO-CR=CR′-OH react with CoMe(PMe 3 ) 4  via oxidative substitution to form low-spin d 6  complexes mer-CoH(CO-CR=CR-O)(PMe 3 ) 3 . Reductive elimination of acyl and hydride functions from cis positions at the metal is less favourable than in carbonyl cobalt intermediates through a pronounced stabilization by neutral phosphane σ-donor and dianionic acylenolato chelate ligands. Reactions of the hydride complexes with iodomethane or with protic acids HX afford octahedral molecular complexes mer-CoX(CO-CR=CR′-O)(PMe 3 ) 3  (X =I, OAc) and mer-CoX(CO-CR=CR′-O)(PMe 3 ) 2  (X = OAc, O-CR′=CR-CHO) without opening of the acylenolato chelate ring.

zeitschrift für naturforschung b

Hydrido(acylphenolato)cobaIt(III)-Verbindungen mit Trimethylphosphan-Liganden / Hydrido(acylphenolato)cobalt(III) Compounds Containing Trimethylphosphane Ligands