An ultraviolet absorbing compound of formula (I) below, and photographic elements containing such a compound as an ultraviolet absorber:
wherein:
R4 is H or an alkyl group, and the benzo or phenyl ring shown may be further substituted or unsubstituted;
X is -C(O)O- wherein the carbonyl carbon is bonded to the N of NR4, or X is -SO2-;
L is a bivalent linking group;
p is 0 or 1;
A* is an alkyl group having an asymmetric carbon or silicon atom, and;
wherein the ultraviolet absorbing compound of formula (I) is a mixture of two enantiomers about the asymmetric carbon or silicon of A*.
下式(I)的紫外线吸收化合物,以及含有这种化合物作为
紫外线吸收剂的照相元件:
其中
R4 是 H 或烷基,所示苯环或苯基可进一步取代或未取代;
X 是-C(O)O-,其中羰基碳与 NR4 的 N 键合,或 X 是-SO2-;
L 是二价连接基团;
p 为 0 或 1;
A* 是具有不对称碳原子或
硅原子的烷基,以及
其中式(I)的紫外线吸收化合物是关于 A* 的不对称碳或
硅的两种对映体的混合物。