Patent ID: 6462192
Filing Date: 2002-10-08
Classification: A61K,C07D

Abstract:
A process for isolating a mono-formylated tetrapyrrolic compound comprising:a) contacting a reaction product containing mono- and di-formylated tetrapyrrolic compounds with a solvent to form a solution thereof; b) adding an alkylcarboxylic acid precipitating solvent to the solution; c) distilling all or a sufficient portion of the first solvent from the solution to precipitate from the solution formylated tetrapyrrolic compounds having a smaller proportion of di-formylated tetrapyrrolic compounds than was present in the reaction product; and d) isolating formylated tetrapyrrolic compounds from the resulting distillate having a smaller proportion of di-formylated tetrapyrrolic compounds than was present in the reaction product.