Twinned Crystal Structure of Bis(2-hydroxy-4,4-dimethyl-6-oxo-1-cyclohexenyl)phenylmethane at 150K

The title compound, 2,2'-(phenylmethylene)bis(3-hydroxy-5,5-dimethylcyclohex-2-en-1-one), C₂₃H₂₈O₄, forms tetragonal crystals twinned on (110). The two molecules in the asymmetric unit differ only in the conformation of one of the two cyclohexenone rings which display the expected envelope conformation; while three apices are extended towards the phenyl ring, one is directed away from it. The molecules form two strong intramolecular hydrogen bonds connecting the two cyclohexenone rings. The X-ray structure analysis was undertaken to ascertain the nature of a reaction product.

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