Study on the phosphenium cation (I). -Synthesis and characterization of 5-methylthio-3-N-phenyl-2,3-2(H)-1,3,4,2-thiadiazaphosphenium cation and the others

Ten years after the first synthesis of neutral two-coordinated phosphorus in 1962, the first phosphenium cations were synthesized by Fleming, Lupton and Jekot in 1972^[1]. Up to now, though 30 years have passed, the members of these phosphenium cations are still very few. the research of phosphenium cations is only limited in France, America and other countries. In our laboratory work was done on a new unique cation: the 5-methylthio-3-N-phenyl-2,3-2(H)-1,3,4,2-thiadiazaphosphenium cation which was found and characterized by 261.9 ppm conclusively of ³¹P NMR. It also has an electric conductivity in nucleophilic and electrophilic reactions. We are interested in noticing that these phosphenium cations are stabilized by one sulfur atom besides nitrogen atoms.