A mixed Ullmann reaction between 2- and 4-chloro-3-nitropyridines furnished 3,3′-dinitro-2,4′-bipyridyl and reduction to 2,5,9,10-tetra-azaphenanthrene followed by thermal extrusion of nitrogen gave 1,6-diazabiphenylene; different complexing abilities of the two nitrogen atoms of this compound were revealed by 1H nmr using Eu(fod)3 which are consistent with previous work on the rehybridisation in strained
2-和4-
氯-3-
硝基吡啶之间的混合Ullmann反应提供了3,3'-二硝基-2,4'-联
吡啶,还原为2,5,9,10-四氮杂
菲,然后进行氮气热挤压1,6-二氮杂
联苯; 该化合物的两个氮原子的不同络合能力通过显示1个H核磁共振使用
铕(FOD)3,其是与在应变环系统上再杂交以前的工作和的值一致的1 Ĵ CH在亚
联苯基。