High purity phthalein derivatives and method for preparing same

Details High purity phthalein derivatives and method for preparing same High purity phthalein derivatives and method for preparing same

2011-08-09

2011-08-09

Solola, Taofiq A (Department: 1622)

Drug, bio-affecting and body treating compositions

Designated organic active ingredient containing

Having -c-, wherein x is chalcogen, bonded directly to...

C549S344000

Reexamination Certificate

active

07994215

ABSTRACT:
High purity phthalein derivatives are useful for medical applications and/or in the field of biotechnology. The phthalein derivatives are prepared by a method whereby a phthalic anhydride derivative is condensed with a naphthol or phenol derivative in an organic acid ester and the crystals of the resulting condensate are converted by action of a strong acid or one of its precursors in anhydrous medium.

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