Synthesis of Diphenylphosphine Oxide and Diethyl Phosphonate with 4-Dimethylsila-2-hexen-6-ol Moiety

Two reagents useful for the Horner-Wittig or Wadshworth-Emmons reaction: 3-(2-hydroxyethyldimethylsila)-2-propen-1-yldiphenylphosphine oxide (5a) and diethyl 3-(2-hydroxyethyldimethylsila)-2-propen-1-ylphosphonate (5b) were synthesized from propargyl chloride and dimethylchlorosilane. The usefulness of phosphine oxide was demonstrated in the olefination reactions of benzaldehyde and hexanal.