The presence of a second 1,3-diborata-2,4-diphosphoniocyclobutane-1,3-diyl in the para-position of a phenylene linker favors the diradical form over the 1,3-diborata-2,4-diphosphoniobicyclo[1.1.0]butane bond stretch isomer, as long as the two planar diradical units are coplanar with the linker. This demonstrates that two BPBP diradicals communicate through the phenyl ring.
在亚苯基连接体的对位上存在第二个 1,3-二
硼烷-2,4-二
磷酸二
环丁烷-1,3-二基,只要两个平面二维单元与连接体共面,二维形式就比 1,3-二
硼烷-2,4-二
磷酸二环[1.1.0]
丁烷键伸展异构体更有利。这表明两个 BPBP 二叉单元通过苯基环进行沟通。