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    • 7. 发明公开
    • Chromogenic compounds
    • 色素变异体
    • EP0124377A2
    • 1984-11-07
    • EP84302885.3
    • 1984-04-30
    • YAMAMOTO KAGAKU GOSEI CO., LTD.
    • Ikegami, SeishiAmako, Takamichi
    • C07D307/94C07D491/107B41M5/145B41M5/26
    • B41M5/145B41M5/327C07D307/94C07D491/10
    • Chromogenic fluorene-9-spiro-lactones have the formula:
      where R 1 , R 2 , R 3 , R 4 and E have defined meaning. The compounds can be made by diazotizing and then effecting a ring closing reaction on the corresponding precursor primary amino-substituted phthalide, furopyridine or furopyrazine. Compounds where E is a group of the formula
      and R 1 , R 2 , R 3 , R 4 , R 5 and R 6 are each C 1 -C 4 alkyl groups are preferred. The compounds are chromogenic and can be used in pressure and/or heat sensitive record material. They give lightfast blue to green colours when reacted with electron accepting co-reactants. The coloured forms exhibit marked absorption in the near infrared making them particularly useful in OCR detection systems.
    • 显色芴-9-螺 - 内酯具有下式:其中R 1,R 2,R 3,R 4和E具有定义的含义。 化合物可以通过重氮化制备,然后在相应的前体伯氨基取代的苯酞,呋喃啶或呋喃并吡嗪上进行闭环反应。 其中E为式(CHEM)和R 1,R 2,R 3,R 4,R 5和R 6的基团的化合物优选为C 1 -C 4烷基。 这些化合物是显色的,可用于压力和/或热敏记录材料。 当与电子接受共反应物反应时,它们呈现快速的蓝色至绿色。 着色形式在近红外表现出明显的吸收,使得它们在OCR检测系统中特别有用。