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专利名称：Process for producing derivatives of
hydroxy-methylene diphosphonic acid
发明人：LEROUX, YVES申请号：EP83401701.4申请日：19830824公开号：EP0104974B1公开日：19870311
摘要：New process for the production of derivatives of hydroxy-methylenediphosphonic acid from the corresponding carboxylic acid comprising: a) mixing saidcorresponding carboxylic acid with a P III reactant selected from the group comprised ofphosphorus tri-halides, phosphorous acid and mixtures thereof, the reaction mixturebeing protected from moisture; characterized in that the molecular ratio between the PIII reactant and said corresponding carboxylic acid is comprised between 13/12 and 18/12and in that it further comprises the step: b) heating said reaction mixture to atemperature comprised between 80 and 110C during a period of time comprisedbetween 3 and 20 hours approximately.
申请人：MINEMET RECHERCHE
地址：1, avenue Albert Einstein B.P. 106 F-78191 Trappes Cédex FR
国籍：FR
代理机构：Ricalens, François (FR)
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