Detomidine hydrochloride crystallization method
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United States of America Patent
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Jun 1, 2010
Grant Date -
Nov 20, 2008
app pub date -
Apr 13, 2006
filing date -
Apr 15, 2005
priority date (Note) -
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Abstract
A method of isolating detomidine (I) hydrochloride as a crystalline salt is provided. The method comprises hydrogenating in the presence of a catalyst of compound of formula (II) in aqueous solution comprising hydrochloric acid, concentrating the solution by distillation, optionally adding hydrochloric acid to the concentrated solution, cooling the concentrated solution and recovering the crystallized detomidine hydrochloride. The product can be recovered directly from aqueous solution with
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