| abstract |
The invention relates to a process the preparation of compounds of the general formula (see formula) R 1 is alkyl; R2, R3, R4, R5 and R 6 are independently hydrogen, alkyl or alkenyl; X is hydrogen, halogen, alkyl or alkoxy; and the dashed link is an optional link; to new light filtration compositions containing certain of the compounds of formula I; and to certain new compounds of the formula I and other new 2-substituted phenyl-benzotriazole compounds. |