Method for purifying phthalides

Details Method for purifying phthalides Method for purifying phthalides

C - Chemistry, Metallurgy

07

D

C07D 307/88 (2006.01) C25B 3/04 (2006.01)

Patent

CA 2303876

Pure phthalides are produced from the reaction mixtures obtained in the phthalide production process by a) distilling off compounds with a boiling point below the boiling point of the phthalide from the reaction mixture, if such compounds are present, to obtain a residue of crude phthalide, and b) crystallising phthalide from a melt of the crude phthalide.

L'invention concerne des phtalides provenant de mélanges de réaction issus de la préparation de phtalide, qui sont préparés de manière pure, par (a) chasse par distillation de composés dont le point d'ébullition est inférieur à celui du phtalide issu du mélange réactionnel, lorsque ces composés sont présents dans le mélange réactionnel, afin d'obtenir un phtalide brut comme résidu de distillation; (b) cristallisation du phtalide issu du phtalide brut en fusion.

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