申请人:Council of Scientific and Industrial Research
公开号:US06320056B1
公开(公告)日:2001-11-20
The invention also pertains to a process for their preparation of bromo functionalised benzotriazole UV absorber of the general formula 1
wherein R1 is hydrogen, tert-butyl; X1 is selected the group consisting of hydrogen, halogen, tert-butyl and C1 to C12 alkoxy by reacting a benzotriazole having formula 2
wherein R1 is hydrogen, tert-butyl; X1 is selected the group consisting of hydrogen, halogen, tert-butyl and C1 to C12 alkoxy with bromine in the presence of a free radical initiator in a non-polar solvent to produce a bromo functionialized benzotriazole.
本发明还涉及一种制备溴功能化苯并三唑UV吸收剂的方法,该吸收剂的一般式为1,其中R1为氢、叔丁基;X1选择从氢、卤素、叔丁基和C1到C12烷氧基中选择的一组,通过在非极性溶剂中存在自由基引发剂的情况下,将具有式2的苯并三唑(其中R1为氢、叔丁基;X1选择从氢、卤素、叔丁基和C1到C12烷氧基中选择的一组)与溴反应,从而产生溴功能化苯并三唑。