ORGANIC SOLVENT-FREE PROCESS FOR THE PREPARATION OF 2-(2-NITROPHENYLAZO)PHENOLS

摘要

Provided is a novel one-pot, organic solvent-free process for the preparation of 2-(2-nitrophenylazo) substituted phenols. The 2-(2-nitrophenylazo) substituted phenols are precursors for hydroxyphenylbenzotriazole UV absorbers.