Patent ID: 6756499
Filing Date: 2004-06-29
Classification: C07D

Abstract:
A process for the preparation of a diol functionalized UV absorber of formula 1 where R1 is hydrogen, tert-butyl; X1 is selected the group consisting of hydrogen, halogen, tert-bulty and C1 to C12 alkoxy; R2 is C2 to C8 linear or branched alkyl, said process comprising reacting a bromo-functionalized benzotriazole UV absorber of formula 4: wherein R1 is hydrogen, tert-butyl; X1 is selected the group consisting of hyrdrogen, halogen, tert-butyl and C1 to C12 alkoxy, with diethanol diamine in an organic solvent under reflux at a temperature in the range of 70 to 90Â° C. for a time period ranging from 5-8 hrs, removing the solvent recrystallizing the resultant compound to obtain the desired pure compound.