Patent ID: 7999128

Claim:
A process for the preparation of hydroxyphenylbenzophenone of formula which comprises reacting a siloxanol compound of formula with a benzophenone carboxylic acid or anhydride of the formula wherein R 1 and R 2 independently from each other are hydrogen; C 1 -C 20 alkyl; C 2 -C 20 alkenyl; C 3 -C 20 cycloalkyl; C 3 -C 10 cycloalkenyl; or R 1 and R 2 together with the linking nitrogen atom form a 5-6-membered heterocyclic ring; R 3 R 4 and R 5 independently from each other are C 1 -C 4 alkyl; C 1 -C 4 alkoxy; or a radical of formula R 6 is C 1 -C 6 alkyl; A is a straight-chain or branched C 3 -C 6 alkylene, which is optionally interrupted by one or more *—O—*, or *—O—(CO)—* groups; and m is 0; or a number from 1 to 5.