Conjugate addition of alkyl- and vinyl-copper complexes to α,β,-unsaturated phosphonic esters. Stereospecific syntheses of γ,δ-unsaturated phosphonates
Abstract
Alkylcopper complexes add to diethyl ethenylphosphonate to afford phosphonic esters with the alkyl chain increased by two carbon atoms; analogously vinylcopper complexes afford γ,δ-unsaturated phosphonic esters with retention of configuration in the double bond.