发明授权
US3853869A 7-(1-ethyl-2-methylindol-3-yl) 7-(substituted)-5,7-dihydrofuro (3,4-b) pyrazin-5-one
失效
7-（1-乙基-2-甲基吲哚-3-基）7-（取代的）-5,7-二氢呋喃（3,4-B）吡嗪-5-酮
- 专利标题： 7-(1-ethyl-2-methylindol-3-yl) 7-(substituted)-5,7-dihydrofuro (3,4-b) pyrazin-5-one
- 专利标题（中）： 7-（1-乙基-2-甲基吲哚-3-基）7-（取代的）-5,7-二氢呋喃（3,4-B）吡嗪-5-酮
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申请号： US35283273申请日： 1973-04-19
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公开(公告)号： US3853869A公开(公告)日： 1974-12-10
- 发明人: FARBER S
- 申请人： NCR
- 专利权人： NCR
- 当前专利权人： NCR
- 优先权： US35283273 1973-04-19; US20532571 1971-12-06
- 主分类号： B41M5/136
- IPC分类号： B41M5/136 ; B41M5/145 ; C07D491/04 ; C07D491/048 ; C09B11/26 ; C07D51/76
摘要：
A novel chromogenic compound of normally colorless form is disclosed, having the structural formula:
WHEREIN EACH X is
WHEREIN EACH R is hydrogen, an alkyl radical having 1 to 4 carbon atoms, an alkoxy radical having 1 to 4 carbon atoms or a phenyl radical. These colorless, but colorable dyes are employed in pressure-sensitive record material and mark-forming manifold systems.
WHEREIN EACH X is
WHEREIN EACH R is hydrogen, an alkyl radical having 1 to 4 carbon atoms, an alkoxy radical having 1 to 4 carbon atoms or a phenyl radical. These colorless, but colorable dyes are employed in pressure-sensitive record material and mark-forming manifold systems.
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