Patent ID: 6936739

Claim:
A compound of formula (I) wherein R are each, independently of one another, F, Cl, Br, I, CN, COOR 2 , C 1 -C 4 -alkyl, C 1 -C 4 -alkoxy, C 1 -C 4 -alkylthlo, C 1 -C 4 -perfluoroalkyl, C 1 -C 4 -perfluoroalkoxy, C 1 -C 4 -perfluoroalkylthio, C 1 -C 4 -polyfluoroalkyl, C 1 -C 4 -polyfluoroalkoxy, or C 1 -C 4 -polyfluoroalkylthio, R 2 is C 1 -C 4 -alkyl, and n is an integer from 1 to 4.