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    • 10. 发明公开
    • CARBAZOLE DIOXAZINE PIGMENT AND A METHOD FOR ITS PREPARATION
    • 咔唑二恶嗪颜料及其制备方法
    • EP3008133A2
    • 2016-04-20
    • EP14810946.5
    • 2014-06-11
    • Gharda, Keki Hormusji
    • Gharda, Keki Hormusji
    • C09B5/26C09B5/60C07D498/22C07D498/04
    • C09B19/02C09D11/037C09D11/322
    • The present disclosure provides carbazole-dioxazine pigment of Formula I; wherein, R is C
      1 -C
      8 alkyl group, preferably R is an ethyl group, R
      1 is a chloro group, and R
      2 is a -NHC(=O)Ph group. The pigment is synthesized from 3-nitro-N-ethylcarbazole. The first step is nitration of 3-nitro-N-ethylcarbazole to form 3,6-dinitro-N-ethylcarbazole which is reduced to form 3-amino-6-nitro-N-ethylcarbazole. This amino compound is benzoylated to form 3-benzamido-6-nitro-N-ethylcarbazole which is then hydrogenated to form 6-amino-3-benzamido-N-ethylcarbazole. Condensation of 6-amino-3-benzamido-N-ethylcarbazole with chlroanil provides an intermediate. Cyclization of the intermediate in the presence of a cyclization reagent provides the compound of Formula-I. The pigment has wavelength of maximum absorption (λ
      max ) at 571nm in dimethylformamide as a solvent.
    • 本公开提供式I的咔唑 - 二恶嗪颜料; 其中,R为C 1 -C 8烷基,优选R为乙基,R 1为氯基,R 2为-NHC(= O)Ph基。 颜料由3-硝基-N-乙基咔唑合成。 第一步是硝基化3-硝基-N-乙基咔唑以形成3,6-二硝基-N-乙基咔唑,其被还原形成3-氨基-6-硝基-N-乙基咔唑。 将该氨基化合物苯甲酰化形成3-苯甲酰氨基-6-硝基-N-乙基咔唑,然后将其氢化形成6-氨基-3-苯甲酰氨基-N-乙基咔唑。 6-氨基-3-苯甲酰氨基-N-乙基咔唑与氯苯胺的缩合提供了中间体。 中间体在环化试剂存在下的环化提供了式I化合物。 该颜料在作为溶剂的二甲基甲酰胺中具有在571nm处的最大吸收波长(λmax)。