Benzotriazole-based UV absorbers and photographic elements containing them

摘要

An ultraviolet absorbing compound of formula (I) below, and photographic elements containing such a compound as an ultraviolet absorber: (I) wherein: R4 is a substituted alkyl group, R4 may be further joined to either L or A* forming a ring and the benzo or phenyl ring shown may be further substituted or unsubstituted; L is a bivalent linking group; p is 0 or 1; A* is an alkyl group having an asymmetric carbon or asymmetric silicon atom, and; wherein the ultraviolet absorbing compound of formula (I) is a mixture of two enantiomers about the asymmetric carbon or silicon atom of A*.