CAS: 35693-99-3; 2,2',5,5'-Tetrachloro-1,1'-Biphenyl

上下游产品

2,5-dichloroiodobenzene 2,5 dichloroaniline para-dichlorobenzene 2,2',3,3',6,6'-hexachlorobiphenyl 2-chloro-1,1'-biphenyl 2,5,2'-trichlorobiphenyl 2,5,3'-trichlorobiphenyl 2,2'-Dichlorobiphenyl

📜1,4-二氯苯置于1,10-菲罗啉,(1,5-Cyclooctadiene)(Methoxy)Iridium(I) Dimer,Copper Diacetate,4,4'-二叔丁基-2,2'-二吡啶体系中,用 四氢呋喃,N,N-二甲基甲酰胺 用作溶剂,化学反应 36.0H,反应生成2,2',5,5'-四氯联苯
参考文献:经由ch硼化的芳烃立体控制ch / Ch均偶联.
标题:经由ch硼化的芳烃立体控制ch / Ch均偶联.
摘要:描述了一种温和的一锅法方案,该方案通过顺序的ir催化的ch硼酸酯化和cu催化的芳烃均偶联合成对称的联芳基.所形成的联芳基的区域化学空间上受ch硼酸酯化步骤的控制.该方法还成功地扩展到了杂芳烃.通过这种方法获得的某些产品无法通过ullmann或suzuki耦合协议获得.最后,我们显示了一锅序列描述了ch硼化/ Cu催化的均偶联/ Pd催化的suzuki偶联以获得π扩展的芳烃骨架.
Doi:10.1039/c9Ob00995G

专利信息

专利号:US-5243032-A
优先权日:1989-06-22
标题:Preparation of azo pigments with low pcb content by coupling in the presence of olefins
发明人：RIEPER WOLFGANG
权利人:HOECHST AG
摘要: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. n According to the invention, it has now been found that by addition of water-soluble olefins of the type ##STR1## (R =H, alk or Oalk; X =--COOR 1 , --CONHR 2 or --NR 3 COR 4 ) n in the azo coupling, the side reactions which form PCBs can be decidedly suppressed during synthesis of the pigments.