Synthesis of biphosphonate compounds can be advantageously carried out in a solvent/diluent comprising a compound of formula (3)
wherein R is hydrogen or a C1-C6 alkyl group; each of R1 is a C1-C6 alkyl group or both R1 groups are linked to form a C1-C3 alkylene group; and R2 is hydrogen, a C1-C6 alkyl group, a C1-C6 alkoxy group, or is linked together with R to form a C3-C7 carbon ring.
双膦酸盐化合物的合成可以优势地在包含以下式(3)中R为氢或C1-C6烷基基团的化合物的溶剂/稀释剂中进行;其中每个R1是C1-C6烷基基团,或者两个R1基团连接在一起形成C1-C3烷基基团;以及R2为氢、C1-C6烷基基团、C1-C6烷氧基团,或者与R连接在一起形成C3-C7碳环。