Process for the preparation of vinyldiphosphonic acid and salts thereof
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United States of America Patent
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May 9, 1989
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N/A
app pub date -
Jun 30, 1987
filing date -
Jul 7, 1986
priority date (Note) -
Expired
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Abstract
An improved process for the preparation of vinyldiphosphonic acid is disclosed. The process involves elimination of a volatile acid from a 1-(O-acyl)-ethane-1,1-diphosphonic acid. The starting materials may be prepared by reacting 1-hydroxyethane-1,1-diphosphonic acid with the corresponding acid or directly by reacting the acid with phosphorous acid and an acyl anhydride.
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