US2005080269A1PendingUtilityA1

Process for the preparation of 1,2-dichloroethane free crystals of zonisamide

Priority: Jan 13, 2003Filed: Aug 8, 2003Published: Apr 14, 2005

Est. expiryJan 13, 2023(expired)· nominal 20-yr term from priority

Inventors:Yoshikazu Ueno Yasujiro Kimura

C07D 261/20A61P 25/08

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References

Claims

Abstract

A process for the preparation of crystals of zonisamide containing residual 1,2-dichloroethane of not more than 5 ppm, by adding an aqueous C 2-4 alcohol to crystals of zonisamide containing residual 1,2-dichloroethane of more than 5 ppm, removing the 1,2-dichloroethane by azeotropic distillation, followed by collecting the precipitated crystals from the residual mixture.

Claims

exact text as granted — not AI-modified

1 - 6 . (canceled)  
     
     
         7 . Zonisamide crystals containing less than 1 ppm of residual 1,2-dichloroethane.  
     
     
         8 . 1,2-Benzisoxazole-3-methanesulfonamide crystals having a residual 1,2-dichloroethane content, said residual content being not more than 5 ppm.

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