Patent ID: 8895754

Claim:
A process for the manufacture of benzotriazole derivatives of formula (Ib): said process comprising the step of reacting a 2-(2H-benzotriazol-2-yl)-6-chloromethyl-phenol derivative of formula (IIb): with an alcohol of the formula R 5 —OH in the presence of a base which is at least one selected from the group consisting of an alkali metal carbonate, an alkaline earth metal carbonate, an alkali metal bicarbonate and an alkaline earth metal bicarbonate, wherein in the formulas: R 2 is hydrogen; C 1-30 alkyl; C 1-5 alkoxy; C 1-5 alkoxycarbonyl; C 5-7 cycloalkyl; C 6-10 aryl or aralkyl; R 3 is hydrogen; C 1-5 alkyl; C 1-5 alkoxy or halogen; R 4 is hydrogen or C 1-5 alkyl; and R 5 is C 1-30 alkyl or C 5-10 cycloalkyl.