| 摘要 |
PCT No. PCT/EP90/00955 Sec. 371 Date Feb. 21, 1992 Sec. 102(e) Date Feb. 21, 1992 PCT Filed Jun. 16, 1990 PCT Pub. No. WO90/15844 PCT Pub. Date Dec. 27, 1990.The production which is customary in practice of monoazo compounds based on dichloro- and trichloroanilines or disazo compounds of the chlorinated biphenyl series by conventional coupling methods meets with difficulties in that the resulting pigments are contaminated by traces of polychlorinated biphenyls. According to the invention, it has now been found that by addition of water-soluble olefins of the type <IMAGE> (R =H, alk or Oalk; X =-COOR1, -CONHR2 or -NR3COR4) in the azo coupling, the side reactions which form PCBs can be decidedly suppressed during synthesis of the pigments.
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