[2,3]-Sigmatropic Rearrangement of Ylides Resulting from the Reaction of a Diazomethylphosphonate with Allylic Sulfides. Synthesis of New α-Phosphorylated Unsaturated Sulfides - Gulea, Mihaela; Marchand, Patrice; Masson, Serge; Saquet, Monique; Collignon, Noël (Synthesis, 1998)