S. Masson et al., FIRST SYNTHESIS OF A (MERCAPTOMETHYLENE) DIPHOSPHONATE VIA A PHOSPHOROTHIOLATE-]MERCAPTOPHOSPHONATE REARRANGEMENT, Tetrahedron, 54(8), 1998, pp. 1523-1528
Diisopropyl S-[(diisopropylphosphono)methyl] phosphorothiolate was dep
rotonated with butyllithium. The lithiated carbanion underwent a [1,2]
-sigmatropic shift, and rearranged into the (mercaptomethylene) diphos
phonate anion which, by protonation, led to a (mercaptomethylene) diph
osphonate. Some derivatives were prepared. (C) 1998 Elsevier Science L
td. All rights reserved.