Regioselective bromine–lithium exchange reactions on polybrominated biaryls enable the modular synthesis of various polysubstituted biphenyls such as bis(dialkylphosphino)-, bis(diarylphosphino)- and dialkyl(diaryl)phosphinobiphenyls. All permutations of substituents at the ortho positions of the biphenyls are possible. In a similar manner, one can gain access to monophosphine analogues. So far, such a process, based on the effective discrimination between bromine atoms as a function of their chemical environment, has been observed only sporadically.
多溴联苯上的选择性溴-锂交换反应实现了各种多取代联苯的模块化合成,例如双(二烷基膦基)-、双(二芳基膦基)-和二烷基(二芳基)膦基联苯。联苯的邻位取代基的所有排列组合都是可能的。类似地,人们可以获得单膦类似物。到目前为止,基于对溴原子在其化学环境中的有效区分而实现的这种过程仅偶尔被观察到。