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Steroidal Wheel-and-Axle Host Type Molecules: Insights from Awkward Shape, Conformation, Z ′ > 1 and Packing

2014; American Chemical Society; Volume: 14; Issue: 9 Linguagem: Inglês

10.1021/cg500772f

1528-7505

Pedro I. Ramírez-Montes, Marı́a E. Ochoa, Rosa Santillán, Daniel J. Ramírez, Norberto Farfán,

Crystal structures of chemical compounds

The synthesis and crystal structure of three new molecular rotors derived from levonorgestrel and norethisterone are reported. The conformation, close contacts, and shape characteristics of these molecules exhibiting Z′ = 2 and the inclusion of solvent molecules were analyzed together with the crystal structures of parent molecules retrieved from the Cambridge Structural Database. For the set of estranes studied, we confirmed that whenever an alternative conformer cannot satisfy the crystallographic symmetry, a second molecule is incorporated in the asymmetric unit resulting in conformational isomorphism (Z′ > 1). The shape of these molecules could make them interesting as potential hosts.