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4a-Hydr­oxy-9-(3-nitrophen­yl)-3,4,4a,5,6,7,9,9a-octa­hydro-2H-xanthene-1,8-dione

✍ Scribed by Hua, Guoping ;Xu, Jianing ;Jiang, Bo ;Zhang, Yan ;Tu, Shujiang

Publisher
International Union of Crystallography
Year
2005
Tongue
English
Weight
156 KB
Volume
62
Category
Article
ISSN
1600-5368

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In the title compound, C 26 H 27 NO 4 , the central ring of the xanthene moiety is planar and the two outer rings are in halfboat conformations. The molecular packing in the crystal structure is stabilized by N-HÁ Á ÁO and C-HÁ Á ÁO hydrogen bonds in addition to van der Waals forces.

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In the title compound, C 23 H 28 N 2 O 2 , the pyran ring in the xanthene moiety adopts a half-chair conformation. The molecular structure is in¯uenced by intramolecular NÐ HÁ Á ÁN and CÐHÁ Á ÁO hydrogen bonds and the crystal structure is stabilized by CÐHÁ Á ÁO and CÐHÁ Á Á% interactions.

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✍ Bigdeli, M. Ali ;Mahdavinia, Gholam Hossein ;Amani, Vahid 📂 Article 📅 2007 🏛 International Union of Crystallography 🌐 English ⚖ 646 KB

The title compound, C 23 H 25 BrO 3 , was synthesized by the reaction of p-bromobenzaldehyde with dimedone and HClO 4 / SiO 2 in EtOH. In the molecule, the dihydropyran ring adopts a boat conformation and the two cyclohexene rings are in a trans conformation.

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The title compound, C 20 H 29 NO 3 ÁH 2 O, has been synthesized by the reaction of hydroxylamine with butyraldehyde and dimidone in ethylene glycol under microwave irradiation. The dihydropyridine ring adopts a boat conformation.