New methods for β-conjugate addition and β-hydroxyalkylation of enones

β-Conjugate addition and β-hydroxyalkylation of enones have been accomplished by the reaction of ylides, derivated from enones via phosphoniosilylation, with activated olefins and aldehydes in the presence of trimethylsilyl triflate in tetrahydrofuran at −78 °C and subsequent elimination of phosphonium salts by one-pot procedure.