In the following model displays carbon is dark gray, hydrogen is cyan, oxygen is red and nitrogen is blue. The conformational motion about the single bond linking the benzene rings is shown for biphenyl itself on the left. The ortho substituents on the derivative shown to the right restrict passage through a planar configuration.

Spacefill Model  Stick Model  Ball & Stick Model	Spacefill Model  Stick Model  Ball & Stick Model

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End of this supplementary topic

Triphenylmethyl

Spacefill Model  Stick Model