Process for preparing pure crystalline lorazepam
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United States of America Patent
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Feb 26, 2002
Grant Date -
Nov 8, 2001
app pub date -
Mar 5, 2001
filing date -
Mar 6, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention provides a process for preparing crystalline lorazepam substantially free of bound solvent from a lorazepam alcohol solvate or hydrate by suspending the lorazepam solvate in an organic medium selected from ethyl acetate, cyclohexane, dichloromethane, toluene and mixtures thereof. This process is useful in producing the anti-anxiety and sedative agent lorazepam in increased yields. A process for converting lorazepam lower alcohol solvates to lorazepam hydrate is also disclosed.
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