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6,6,8a-Tri­methyl-3a,6,7,8a-tetra­hydro­benzo­[b]­furo­[3,2-d]­furan-2,4(3H,5H)-dione

✍ Scribed by Nagaraj, Basavegowda ;Yathirajan, Hemmige S. ;Nagaraja, Padmarajaiah ;Lynch, Daniel E.

Publisher
International Union of Crystallography
Year
2005
Tongue
English
Weight
106 KB
Volume
61
Category
Article
ISSN
1600-5368

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✦ Synopsis

The structure of the title compound, C 13 H 16 O 4 , comprises a non-planar chiral molecule where the cyclohexene double bond is distinctly shorter [1.335 (2) A ˚] than the neighbouring C-C single bonds (>1.4 A ˚).

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The crystal structure of the title benzofuran derivative, C~16~H~23~NO~3~, has been elucidated. The tricyclic core, __i.e.__ the tetrahydrobenzo–dihydrofuro–pyrrolidine ring system, is non-planar owing to the folding of the five-membered rings at their __cis__ junction. The cyclohexene ring assumes