J. Vepsalainen et al., BISPHOSPHONIC COMPOUNDS .5. SELECTIVE PREPARATION OF (DICHLOROMETHYLENE)BISPHOSPHONATE PARTIAL ESTERS, Tetrahedron letters, 34(28), 1993, pp. 4551-4554
The Preparations of tri-, P.P'-di-, P,p-di- and mono partial esters of
(dichloromethylene)bisphosphonic acid with good selectivity and purit
y have been described.