Patent ID: 7355021
Filing Date: 2008-04-08
Classification: C07C

Abstract:
1. A single pot process for the preparation of diazonaphthoquinonesulfonyl ester having the general formula 1, which comprises wherein X=O or N R reacting diazonaphthoquinonesulfonic acid or its sodium salt with triphosgene or diphosgene in an organic solvent, in the presence of tertiary organic base, at a temperature in the range of −50 to −30° C., for a period of about 1 hr, bringing the temperature of the above said reaction mixture to about 0° C., adding subsequently a hydroxyl compound and a tertiary organic base taken in an organic solvent to the above said reaction mixture, followed by stirring for another about 1 hr, distilling off the organic solvent and tertiary organic base under vacuum, at a temperature in the range of 25-30° C. to obtain the desired product.