Patent ID: 7414138

Claim:
A compound of general formula I wherein R 1 and R 2 are, independently from each other, hydrogen; halogen; hydroxy; (C 1 -C 20 )-alkyl; (C 2 -C 20 )-alkenyl; or (C 1 -C 20 )-alkoxy; X is oxygen or an imino group, optionally substituted with R 1 ; R 3 and R 4 are, independently from each other, cyano; —COOR 5 ; —COR 6 ; —CONH 2 ; —CONHR 7 ; or —CONR 8 R 9 ; R 5 , R 6 , R 7 , R 8 and R 9 are, independently from each other, hydrogen; (C 1 -C 20 )-alkyl, wherein one or more methylene groups are optionally replaced by one or more oxygens; (C 1 -C 20 )-haloalkyl; (C 2 -C 20 )-alkenyl, optionally substituted by tri-(C 1 -C 5 )-alkylsilyl, triphenylsilyl or a group —Si[CH 3 ] n [OSi(CH 3 ) 3 ] 3-n , wherein n is 0, 1, 2 or 3.