Patent ID: 7268260

Claim:
A compound of formula (VI) wherein R 3 and R 4 are identical or different and are each benzyl, substituted benzyl, benzhydryl, substituted benzhydryl, isopropyl, tert-butyl, or cyclohexyl, and R are each, independently of one another, hydrogen, F, Cl, Br, I, CN, COOR 2 , C 1 -C 4 -alkyl, C 1 -C 4 -alkoxy, C 1 -C 4 -alkylthio, 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, and n is an integer from 0 to 4; wherein R 2 is C 1 -C 4 -alkyl.