Patent ID: 7144879

Claim:
Compounds of general formula(I) in which; M is selected from the group consisting of Zn, Si(OR 8 ) 2 , Ge(OR 8 ) 2 and AIOR 8 ; R is H or a group selected from alkyl, alkenyl and alkyloxy group, linear or branched, having from 1 to 10 carbon atoms provided that, when R is different from H, the positions 8, 11, 15, 18, 22, 25 or 9, 10, 16, 17, 23, 24 are substituted; and R 1 and R 2 , equal or different from one another, are H or a group (X) p R 3 , wherein X is selected from the group consisting of O, S, -NR 6 and -CH 2 -; and R 3 is where: Y is selected from the group consisting of C 1-10 alkyl and phenyl, optionally substituted, or it forms with the Z group, to which it is bound, a saturated or unsaturated heterocycle, optionally substituted, which may contain up to two heteroatoms selected from the group consisting of N, O and S; Z is selected from the group consisting of -N, -CH 2 N and -CONHCH 2 CH 2 N; R 4 and R 5 , equal or different from one another, are selected from the group consisting of C 1-15 alkyl and phenyl, or form with the Z group, to which they are bound, a saturated or unsaturated heterocycle, optionally substituted, which may contain up to two heteroatoms chosen in the group consisting of N, O and S; R 6 and R 7 , equal or different from one another, are selected from the group consisting of H and C 1 -C 15 alkyl; m, n, p, w, t and u, independently from one another, are 0 or 1 ; and v is integer between 1 and 3 , provided that when R 1 and R 2 is different from H, the position 1 , 4 or 2 , 3 , whereas, when only one between R 1 and R 2 is different from H, the position 1 or 2 is substituted, or R 1 and R 2 , taken together, form a saturated or unsaturated heterocycle, possibly substituted, which may contain up to two heteroatoms selected from the group consisting of N, O and S; R 8 is selected from H and C 1 - C 15 alkyl.