Synthesis of Cobaloxime-Substituted α,β-Unsaturated Acyl Complexes via Reactions of Cobaloxime Anions and/or Hydrides with Ynones, Ynoates, and α,β-Unsaturated Acyl Electrophiles

Cobaloxime anions (pyr(dmg)₂Co^-Na⁺) and/or hydrides (pyr(dmg)₂CoH) react with cinnamoyl chloride and a variety of ynones and ynoates to produce cobaloxime-substituted α,β-unsaturated acyl complexes. The stereochemistry of the alkene produced by the ynone and ynoate hydrometalations can be controlled through choice of hydrometalation reaction conditions. Two of these new acyl complexes have been characterized by X-ray crystallography.