Research on carbon—carbon coupling reactions of haloaromatic compounds mediated by zerovalent nickel complexes. Preparation of cyclic oligomers of thiophene and benzene and stable anthrylnickel(II) complexes
作者:Zhen-hua Zhou、Takakazu Yamamoto
DOI:10.1016/0022-328x(91)83247-2
日期:1991.8
Dehalogenative carbon—carbon coupling reactions of 3,4-dibromothiophene, 1,2-dihalobenzenes and 9-bromoanthracene using zerovalent nickel complexes as a dehalogenating reagent produced respectively cyclotetrathiophene, triphenylene and 9,′9-bianthracene in good yields. However, two extremely stable arylnickel(II) complexes, Ni(10-X-9-anthryl)X(PPh3)2 (X = Br,Cl), where the 10-CX bond in the anthryl
3,4-二溴噻吩,1,2-二卤代苯和9-溴蒽的脱卤碳-碳偶联反应,使用零价镍配合物作为脱卤剂,分别产生了环四噻吩,三亚苯基和9,'9-联蒽。但是,两个极其稳定的芳基镍(II)配合物Ni(10-X-9-蒽基)X(PPh 3)2(X = Br,Cl),其中蒽基中的10-CX键对过量的Ni 0络合物,通过氧化加成的9,10-二- haloanthracenes与Ni获得0络合物。在相似的反应条件下,9,10-二卤代蒽不发生碳-碳偶联反应。