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显影抑制剂释放化合物(DIR化合物)包括DIR成色剂和DIR无色化合物两大类.它们都能选择性地抑制显影,从而改善影像的色调,使图像细腻、轮廓鲜明.其中的DIR无色化合物由于不产生染料,故不仅可用于彩色照相材料中的任何乳剂层,亦可用于黑白照相及X光片等材料中. 据专利报道,1-苯基-2-乙酰氧基-2-[(1-苯基-1 H-四氮唑-5-)巯基]乙酮1是一个有效的DIR无色化合物.作者曾试图根据专利方法加以合成,但所得结果与报道完全不同.于是改变合成路线,首先制得醋酸苯甲酰甲酯,溴化后再与1-苯基-5-巯基-四氮唑的钠盐缩合,从而成功地制得了这一化合物.
Development inhibitor release compounds (DIR compounds) include two major categories of DIR couplers and DIR colorless compounds, all of which selectively inhibit development to improve image tone for a crisp, sharp image. The DIR Colorless Compound Because it does not produce dyes, it can be used not only for any emulsion layer in color photographic materials, but also for materials such as black-and-white photography and X-ray films.Patent reports indicate that 1-phenyl-2-acetoxy-2 - [( 1-Phenyl-1 H-tetrazolium-5-mercapto] ethanone 1 is a potent DIR colorless compound. The authors have tried to synthesize according to a patented method, but the results obtained are quite different from those reported. , Firstly, phenylacetyl acetate is prepared, which is then brominated and then condensed with the sodium salt of 1-phenyl-5-mercapto-tetrazole to successfully obtain this compound.