Preparation of 3-amino-1-hydroxypropane-1, 1-diphosphonic acid
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United States of America Patent
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Aug 11, 1998
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N/A
app pub date -
Aug 13, 1997
filing date -
Sep 3, 1996
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Abstract
A preparation of 3-amino-1-hydroxypropane-1,1-diphosphonic acid includes the steps of: mixing N-alkoxycarbonyl-.beta.-alanine, phosphorous chloride and phosphorous acid in the ratio of 1:1:1.about.1:3:3 in a reaction solvent, xylene at 70.degree.-140.degree. C.; hydrolyzing; and obtaining 3-amino-1-hydroxypropane-1,1-diphosphonic acid as a product, thus decreasing the production of unidentified by-products and giving and low production cost by using xylene instead of chlorobenzene as a reaction solvent.
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