Two efficient procedures involving tin hydride or thiophenol-mediated intramolecular homolytic substitution at the sulfur atom are reported. They lead to the generation of varied P(V)-centered radicals from the corresponding aryl or alkyne thiophosphorus substrates. The radical formed can be trapped by an olefin via an intermolecular addition, leading to the construction of C–P bonds. Thiophosphination
Reactions of O,O'-dialkylthiophosphoric acids with acrylates provide a direct synthetic route to beta-carboxylated thiolophosphates. This Michael addition, without solvent, is quantitative at 90degreesC in 1 h for the 2/1 thiophosphoric acid/acrylate ratio. Moreover, this excess of thiophosphoric acid can be reused for further reactions. (C) 2003 Elsevier Ltd. All rights reserved.