重新审视 Murahashi 偶联,我们发现它有效地允许通过镍 (II) 催化缩聚反应聚合锂化(杂)芳烃。2-氯-3-取代噻吩与正丁基锂的去质子聚合得到头对尾型聚(3-取代噻吩)。聚(1,4-亚芳基)是由相应的二溴化物通过锂-溴交换反应得到的。通过去质子卤素舞蹈获得的锂化噻吩衍生物也经过聚合反应得到溴取代的聚噻吩。
Base-Catalyzed Halogen Dance Reaction and Oxidative Coupling Sequence as a Convenient Method for the Preparation of Dihalo-bisheteroarenes
作者:Yulia A. Getmanenko、Paul Tongwa、Tatiana V. Timofeeva、Seth R. Marder
DOI:10.1021/ol1006423
日期:2010.5.7
A one-pot preparation of the 2,2′-dibromo-1,1′-bisheteroarenes 3a−d from bromo-heteroarenes utilizing the sequence of the base-catalyzed halogen dance (BCHD) reaction and CuCl2-promoted oxidative coupling of the in situ formed α-lithio-β-halo-heteroarenes 2a−d provides a convenient access to precursors for the preparation of tricyclic heteroaromatic cores. The structures of 3a,b,d, 6, and 9 were confirmed
This invention relates to a process for producing aromatic polymers having a high degree of polymerization by subjecting halogenated aromatic compounds or combinations of aromatic compounds and polyhalogenated aromatic compounds to a dehydrohalogenation reaction in the presence of a metal halide and thereby effect a polycondensation. The halogenated aromatic compounds, aromatic compound and polyhalogenated aromatic compounds include not only those compounds having benzene nucleus or nuclei, but also compounds of aromatic character such as heterocyclic five-membered compounds. The resulting polymers are particularly useful in the field of electronics.