Since the structure of biphenyl in crystals bad been determined by X-ray crystal analysis1), it was a subject of interest for many workers to elucidate the conformation of substituted biphenyls by using various physical methods. As the result of extensive works on biphenyl derivatives especially halogenobiphenyls, their conformations have been determined under various conditions. By X-ray method planar structure was advanced for 3, 3'- ...
