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4-Hydroxy-3,4a,8-trimethyl-3,3a,4,4a,7a,8,9,9a-octahydroazuleno[6,5-b]furan-2,5-dione

✍ Scribed by Pu, Shou-Cheng ;Tu, Chun-Ling ;Deng, Yi

Publisher: International Union of Crystallography
Year: 2007
Tongue: English
Weight: 400 KB
Volume: 63
Category: Article
ISSN: 1600-5368
DOI: 10.1107/s1600536807054116

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✦ Synopsis

The title compound, C 15 H 20 O 4 , also known as dihydrohelenalin, is a drug obtained from a Chinese plant. It contains a seven-membered ring in a chair conformation and two fivemembered rings in twist conformations. The crystal packing involves O-HÁ Á ÁO hydrogen bonds.

Related literature

For background, see: Bohlmann & Chen (1980); for similar compounds, see: Giordano et al. (1992). Experimental Crystal data C 15 H 20 O 4 M r = 264.31 Monoclinic, P2 1 a = 6.3634 (13) A ˚b = 12.608 (3) A c = 8.1146 (16) A = 95.59 (3) V = 647.9 (2) A ˚3 Z = 2 Mo K radiation = 0.10 mm À1 T = 113 (2) K 0.10 Â 0.06 Â 0.04 mm Data collection Rigaku Saturn diffractometer Absorption correction: multi-scan (CrystalClear; Rigaku/MSC, 2005) T min = 0.982, T max = 0.996 4971 measured reflections 1605 independent reflections 1508 reflections with I > 2(I) R int = 0.033 Refinement R[F 2 > 2(F 2 )] = 0.030 wR(F 2

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