Introduction In conjunction with some work on conjugated'polyphenyls, it was considered desirable to ascertain the steric interference with coplanarity caused by the introduction of fluorine atoms in the o-positions in the biphenyl structure. In contrast with the corresponding alkyl and chlorine compounds, the o-tetrafluorinated derivatives of biphenyl have not been successfully resolvedI2 although a schematic drawing of the spatial ar-(1)(a) The research ...
