Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
June 14, 2011
Patent Application Number
12229048
Date Filed
August 18, 2008
Patent Primary Examiner
Patent abstract
The invention encompasses processes for obtaining pure armodafinil substantially free of disulfide impurities that is suitable for use on an industrial scale. In particular, a processes for purifying armodafinil from bis(diphenylmethyl)disulfide comprising: dissolving crude armodafinil in ethanol to form a solution; adding a solvent selected from the group consisting of linear or branched C5-C8 alkyl, linear or branched C5-C8 ether, and mixtures thereof to the solution to form a reaction mixture; cooling the reaction mixture; and isolating pure armodafinil from the reaction mixture.
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