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Unformatted text preview: O O H H O H H In class we discussed the symmetry of the allene molecule. For your reference, the molecule is reproduced in three perspectives. In the structure below the hydrogen atoms have been replaced by hydroxyl groups. The hydroxyl groups are all arranged so that they form the same dihedral angle with the central axis, as indicated in the drawing. C C C H H H H C C C O O O O C C C H H H H H H H H C O O O O H H H H C H H H H Determine the point group of the S 8 molecule. Does this molecule have an S 8 symmetry element? S S S S S S S S The triphenylboron molecule is shown in three conformations. In each case, the three phenyl rings are oriented relative to the central axis in the same way (perpendicular, twisted, and parallel). [Think about the same conformations in triphenylamine.] B B B...
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