X-Ray crystallography and the chemistry of the steroids. Part I

Bernal, J. D.; Crowfoot, Dorothy; Fankuchen, I.

doi:10.1098/rsta.1940.0010

Cited by 67 publications

(8 citation statements)

References 7 publications

(6 reference statements)

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“…The plant sterols (phytosterols), on the other hand, each have a monoclinic unit cell (Table 1). CH and PS unit cell parameters were defined by X-ray powder diffraction (XRD) (using TOPAS software [21]) and correspond well to data in the literature [22][23][24][25][26].…”

Section: Methodsmentioning

confidence: 99%

Templated cocrystallization of cholesterol and phytosterols from microemulsions

Rozner

Popov

Uvarov

et al. 2009

Journal of Crystal Growth

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Section: Methodsmentioning

confidence: 99%

Templated cocrystallization of cholesterol and phytosterols from microemulsions

Rozner

Popov

Uvarov

et al. 2009

Journal of Crystal Growth

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“…In the present work an attempt has been made to synthesize a derivative of the cholesterol molecule. Although the title compound (I) crystallized in the same monoclinic space group, P2 1 , as previously reported (Bernal et al, 1940;Vani & Vijayan, 1979), the unit cell is different.…”

Section: Commentmentioning

confidence: 73%

Ethyl 2-{3-[(2-chloro-1,3-thiazol-5-yl)methyl]-4-nitroimino-1,3,5-triazinan-1-yl}acetate

et al. 2010

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In the title compound, C11H15ClN6O4S, which belongs to the neonicotinoid class of insecticidally active heterocyclic compounds, the six-membered triazine ring adopts an opened envolope conformation. The planar nitro imine group [dihedral angle between nitro and imine groups = 1.07 (7)°] and the thiazole ring are oriented at a dihedral angle of 69.62 (8)°. A classical intramolecular N—H⋯O hydrogen bond is found in the molecular structure. Moreover, one classical intermolecular N—H⋯N and four non-classical C—H⋯O and C—H⋯N hydrogen bonds are also present in the crystal structure. Besides intermolecular hydrogen bonds, the Cl atom forms an intermolecular short contact [3.020 (2) Å] with one of the nitro O atoms.

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“…For the structures of the other polymorphs of the title compound, see: Bernal et al (1940); Vani & Vijayan (1979). For ring conformations, see: Cremer & Pople (1975).…”

Section: Related Literaturementioning

confidence: 99%

A second monoclinic polymorph of 3β-chlorocholest-5-ene

et al. 2010

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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.

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X-Ray crystallography and the chemistry of the steroids. Part I

Abstract: X -r a y C r y s t a l l o g r a p h y a n d t h e C h e m i s t r y o f t h e St e r o i d s . P a r t I

Cited by 67 publications

References 7 publications

Templated cocrystallization of cholesterol and phytosterols from microemulsions

Templated cocrystallization of cholesterol and phytosterols from microemulsions

Ethyl 2-{3-[(2-chloro-1,3-thiazol-5-yl)methyl]-4-nitroimino-1,3,5-triazinan-1-yl}acetate

A second monoclinic polymorph of 3β-chlorocholest-5-ene

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