Process for preparing bis (2-hydroxyphenyl-3-benztriazole) methanes

摘要

A 2-hydroxyphenylbenzotriazole is reacted with a formaldehyde and an amino alcohol in an organic solvent in the presence of a basic catalyst. It is thereby possible to obtain bis(2-hydroxyphenyl-3-benzotriazole) methanes efficiently and at a high yield.