A Convenient Protocol for the Synthesis of 2-(2′-Hydroxy-5′-carboxyphenyl)-2H-benzotriazole to Avoid Decarboxylation When Using p-Hydroxybenzoic Acid as Coupling Component
of the synthesis of 2‐(2′‐hydroxy‐5′‐carboxyphenyl)‐2H‐benzotriazole, we found that decarboxy intermediate‐4‐((2‐nitrophenyl)diazenyl)phenol was obtained whenusing p‐hydroxybenzoic acid as couplingcomponent. A convenientprotocol for the synthesis of 2‐(2′‐hydroxy‐5′‐carboxyphenyl)‐2H‐benzotriazole is reported with methyl‐p‐hydroxybenzoate as couplingcomponent. Different dizao components and different