A novel pyrazolonoxonol compound represented by formula (A) and a silver halide photographic material comprising such a pyrazolonoxonol compound:
wherein R₁ and R₂ each represents a hydrogen atom, an alkyl group or an aryl group, and the alkyl groups represented by R₁ and R₂ may bond each other to form a saturated 5- or 6-membered ring; R₃ represents a hydrogen atom, an alkyl group, an aryl group, a heterocyclic group, a hydroxyl group, an alkoxy group, a carboxyl group, an ester group, a carbamoyl group, an amino group, an acylamino group, an ureide group, an urethane group or a cyano group; L₁, L₂, L₃, L₄ and L₅ each represents a methine group, and the methine groups which are not adjacent to each other may bond each other to form a 5- or 6-membered ring; M represents a hydrogen atom or a monovalent cation; and m and n each represent an integer 0 or 1.
一种由式(A)表示的新型
吡唑啉酮醇化合物和一种包含这种
吡唑啉酮醇化合物的卤化
银感光材料:
其中 R₁ 和 R₂ 各自代表氢原子、烷基或芳基,R₁ 和 R₂ 所代表的烷基可相互键合形成饱和的 5 或 6 元环;R₃ 代表氢原子、烷基、芳基、杂环基、羟基、烷氧基、羧基、酯基、
氨基甲酰基、
氨基、酰
氨基、
脲基、
脲烷基或
氰基;L₁、L₂、L₃、L₄ 和 L₅ 各代表一个甲基,且互不相邻的甲基可相互键合形成 5 或 6 元环;M 代表氢原子或一价阳离子;m 和 n 各代表 0 或 1 的整数。