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1.  Cholest-5-ene 
The asymmetric unit of the title compound, C27H46, contains two crytallographically independent cholest-5-ene mol­ecules (A and B). In each mol­ecule, the three six-membered rings are all in chair conformations, while the five-membered ring is in a twist conformation. The terminal isopropyl group of mol­ecule A has a (−)-gauche conformation, whereas that of mol­ecule B has a (+)-gauche conformation. No significant inter­molecular inter­actions are observed in the crystal structure.
doi:10.1107/S1600536811016783
PMCID: PMC3120455  PMID: 21754760
2.  Cholest-5-en-7-one 
In the deca­hydro­phenanthrenone ring system of the title compound, C27H44O, the two cyclo­hexane rings adopt chair conformations, whereas the cyclo­hexene ring adopts an envelope conformation. The cyclo­pentane ring is twisted. In the crystal structure, mol­ecules are stacked along the a axis, but no significant inter­molecular inter­actions are observed.
doi:10.1107/S1600536810021598
PMCID: PMC3007018  PMID: 21587894
3.  A second monoclinic polymorph of 3β-chloro­cholest-5-ene 
The title compound, C27H45Cl, is a second monoclinic polymorph which crystallizes in the space group P21 with four crystallographically independent mol­ecules in the asymmetric unit. The structure was previously reported [Bernal et al. (1940 ▶). Philos. Trans. R. Soc. London Ser. B, 239, 135–182; Vani & Vijayan (1979 ▶). Mol. Cryst. Liq. Cryst. 51, 253–264], also in the space group P21, but with two unique mol­ecules in the asymmetric unit. As in the previously reported structures, rings A and C in the mol­ecule adopt chair conformations with half-chair conformations for rings B and D. The ring junctions B–C and C–D are trans, whereas the junction A–B is quasi-trans. In the crystal structure, mol­ecules are arranged in a head-to-tail fashion along a and are stacked along the b axis.
doi:10.1107/S1600536810015722
PMCID: PMC2979588  PMID: 21579355
4.  3β-Chloro­cholest-5-en-7-one 
The title compound, C27H43ClO, is a steroid derivative composed of a saturated carbon fused-ring framework with an alkyl side chain. The A and C rings have chair conformations and the B and D rings assume half-chair conformations. The cholesterol side chain is fully extended with a gauche, trans conformation of the terminal methyl groups. In the crystal structure, the molecules are aligned in an antiparallel fashion, forming alternate layers. These layers are then linked via C—H⋯O hydrogen bonds, forming a three-dimensional network.
doi:10.1107/S1600536810006380
PMCID: PMC2983643  PMID: 21580431

Results 1-4 (4)