Merocyanine derivatives useful as UV absorbers

摘要

Merocyanine derivatives of the formula (1) wherein L1, L2 and L3 are hydrogen; or L1 and L3 may be linked together to form a carbocyclic ring; R3 and R4 independently of each other are CN, -COR5, -COOR5, - CONR5R6, C1-C22alkyl, C2-C22alkenyl, C2-C22 alkynyl, C3-C12cycloalkyl, C3-C12cycloalkenyl, C7-C20aralkyl, C1-C20heteroalkyl, C3-C12cycloheteroalkyl, C3-C18heteroaralkyl, C6-C20aryl, C1- C12alkylcarbonylamino-C6-C20aryl, C2-C12heteroaryl, or - X2-Sil2; n is 1 to 4; if n = 1, R1 and R2 independently of each other are hydrogen, C1-C22 alkyl, hydroxy-C1-C22alkyl, C2-C22alkenyl, C2-C22 alkynyl, C3-C12cycloalkyl, C3-C12cycloalkenyl, C7-C20aralkyl, C1-C20heteroalkyl, C3-C12cycloheteroalkyl, C3-C18heteroaralkyl, C2-C12heteroaryl, -(CH2)u-SiR8R9R10, or -X1-Sil1; if n 2, R1 and R2 are each C1-C6alkylene; or one of R1 and R2 is C1-C6alkylene and the other is as defined for n = 1; if n = 3, one of R1 and R2 is a trivalent radical and the other is as defined as for n = 1; if n = 4, one of R1 and R2 is a tetravalent radical and the other is as defined as for n = 1; R5 and R6, are hydrogen, -X2-Sil2 or substituents; R8, R9 and R10 are C1-C22alkyl; C6-C20aryl; C1-C22alkoxy; or O-C6-C20aryl; or L3 and R1, R3 and R4, R1 and R2, R5 and R6 may be linked together to form 1, 2, 3 or 4 carbocyclic or N, 0 and/or S-heterocyclic rings, which may be further fused with other aromatic rings and each N in a N-heterocyclic ring may be substituted; X1, X2, X3 and X4 are linkers; Sil1, Sil2, Sil3 and Sil4 independently are a silane-, oligosiloxane or polysiloxane moiety; u is a number from 0 to 12. The compounds may be useful as UV absorbers, either alone or in combination with other UV absorbers, for cosmetic applications.