Process for the preparation of risedronate sodium hemi-pentahydrate
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United States of America Patent
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Feb 3, 2009
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Jan 16, 2007
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Jan 20, 2006
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Abstract
The present invention relates to an improved process for the selective crystallization of 3-pyridyl-1-hydroxyethylidene-1,1-bisphosphonic acid sodium in pure hemi-pentahydrate form of Formula (I), by first converting 3-pyridyl-1-hydroxyethylidene-1,1-bisphosphonic acid into organic amine salt and then by replacing it with sodium salt.
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