Planar Chirality in 2,2-Diphenyl-1,3,6,9-tetraoxacycloundecane

Tamura, H.; Ueno, S.; Ogawa, K.; Nagai, T.; Oshima, T.

doi:10.1107/S0108270197000905

Planar Chirality in 2,2-Diphenyl-1,3,6,9-tetraoxacycloundecane

H. Tamura, S. Ueno, K. Ogawa, T. Nagai and T. Oshima

The crystal of benzophenone crown ether acetal, C₁₉H₂₂O₄, with an 11-membered ring has two crystallographically independent molecules in the unit cell. The bond lengths and angles in the ring moiety are similar to those of analogous crown ethers. The 11-membered rings are greatly twisted to adopt planar-chiral structures and the unit cell contains two sets of enantiomers.

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Planar Chirality in 2,2-Diphenyl-1,3,6,9-tetraoxacycloundecane

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