Spectral study of phosphonium salts synthesized from Michael acceptors

The synthesis of new phosphonium salts derived from Michael acceptors via a one-pot reaction process and the study of their NMR characteristics is described. The simple and rapid 1,4 addition of triphenylphosphine to the Michael acceptors in the presence of HBr (48%) (5 equivalents) was carried out at room temperature to give the corresponding phosphonium salts with excellent yields.