Sodium and Potassium Derivatives of 2-(Diphenylphosphinoyl)-2-Phenyl-Ethenol: Synthesis, Structure and Reactivity

The sodium and potassium derivatives of 2-(diphenylphosphinoyl)-2-phenylethenol (2 and 3, respectively) are obtained and their (E)-enolate structure is proved by spectroscopic methods. The study of their reactivity shows that regiospecific O-acylation of 2 and O-alkylation of 3 takes place, the corresponding 1-acetoxy-2-(diphenylphosphinoy1)-2-phenyl-ethene 4 and 1-benzyloxy-2-(diphenylphosphinoyl)-2-phenyl-ethene 5 is isolated. The reaction of carbonyl olefination is not observed.