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2004
Organo-phosphorus compounds
S 0080
Synthesis of 1-Hydroxymethylene-1,1-bis(phosphonic acids) from Acid AnhyPreparation of a New Cyclic 1-Acyloxymethylene-1,1-bis(phosphonic
44- 194 drides:
acid). — A previously reported synthesis of title bisphosphonic acids from acyl chlorides and P(OTms)3 is adapted to acyclic and cyclic acid anhydrides as starting acyl
compounds. Cyclic anhydrides (III) give a direct access to bisphosphonates (IV), functionalized by an carboxylic group at the side chain. Phthalic anhydride affords cyclic
bisphosphonate (VII). — (GUENIN*, E.; DEGACHE, E.; LIQUIER, J.; LECOUVEY,
M.; Eur. J. Org. Chem. 2004, 14, 2983-2987; Lab. Chim. Struct. Spectrosc. Biomol.,
CNRS, Univ. Paris-Nord, F-93017 Bobigny, Fr.; Eng.) — Klein
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