(2S,3S)-2,6-Di­methyl­heptane-1,3-diol, the oxygenated side chain of 22(S)-hy­droxy­cholestrol, and its synthetic precursor (R)-4-benzyl-3-[(2R,3S)-3-hy­droxy-2,6-di­methyl­hepta­noyl]-1,3-oxazolidin-2-one

Høgmoen Åstrand, O.A.; Iqbal, Z.; Sandberg, M.; Kase, E.T.; Görbitz, C.H.; Rongved, P.

doi:10.1107/S0108270113011852

Acta Crystallographica Section C
Acta Crystallographica
Section C STRUCTURAL CHEMISTRY

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Figure 4
(a) The intermolecular interactions (dashed lines) in the structure of (II)

. For clarity, the benzyl and isopentyl groups are shown as spheres. The dominating zigzag C(6) chain (highlighted in grey) is corroborated by weaker C8—H83⋯O1(−x + 2, y − $[{1\over 2}]$ , −z + 1) hydrogen bonds. The second C—H⋯O interaction in the structure, C12—H121⋯O4(−x + 1, y − $[{1\over 2}]$ , −z + 1), connects the five-membered ring systems, together with a more unusual C10⋯O3(−x + 1, y + $[{1\over 2}]$ , −z + 1) contact of 2.993 (3) Å. (b) π*←n electron donor–acceptor interactions (dashed lines) in the stucture of tetrahydrofuran-3,4-dione (Muller & Jacobson, 1980

); both distances are 2.844 (3) Å.

STRUCTURAL
CHEMISTRY

ISSN: 2053-2296

Volume 69| Part 6| May 2013| Pages 647-650

doi:10.1107/S0108270113011852

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