Patent ID: 7208504

Claim:
A benzotriazole of formula I, in which: n is an integer selected from 0, 1 and 2 R1 to R8 are each H, except that one of R2 and R3 may be selected from Br, Cl, CH 3 , CN, NH2, NO 2 , CF 3 , OCH 3 , phenoxy, benzoyl, CH(OH)-phenyl, S-cyclohexyl, and CO—OCH 3 ; or R1 is Cl and R3 is CF 3 ; or R2 is F and R3 is Cl; or one of R6 and R7 may be selected as follows: R6 is CH 3 or R7 is selected from CH 3 , C 2 H 5 , CH(CH 3 ) 2 , C(CH 3 ) 3 , CF 3 , Br, Cl, benzyl and CO—OC 2 H 5 ; or R6 and R7 each are CH 3 ; or R6 and R7 may be replaced by a double bond between the ring carbon to which they are attached; or R5 and R6 or R6 and R7 may, in combination with the carbon to which they are attached, form a benzo-fused ring or, when n is 0, may form cyclohexanediyl, the ring formed from R6, R7and the carbons to which they are attached being optionally substituted singly by NH 2 or NO 2 or substituted singly or doubly by OCH 3 ; and R7 and R8, together with the carbon to which they are attached, may form cyclopentyl, diazirinediazirine or ═CH 2 ; provided, however, that when R1 to R5 and R8 are H, and R6, R7 and the carbons to which they are attached form a benzo-fused ring, n is not 1, and when R1 and R3–R8 are H and R2 is Ch 3 , n is not 1 and when R1 to R8 are each H, n is 2.