Acta Crystallographica Section C

Crystal Structure Communications

Volume 57, Part 11 (November 2001)

Acta Cryst. (2001). C57, 1326-1329 [doi:10.1107/S0108270101013440]

Diels-Alder adducts of medium-ring carbocyclic dienes prepared by rearrangement of catalytically generated cyclic oxonium ylides

C. Wilson, J. S. Clark, A. L. Bate, A. J. Blake, T. Grinter and S. J. Teat

Abstract: The novel bicyclic and tricyclic systems dimethyl (4aS*,6S*)-6-methoxy-7-oxo-4a,5,6,7,8,9-hexahydro-2H-benzocycloheptene-3,4-dicarboxylate, C₁₆H₂₀O₆, (I), dimethyl (4aS*,6R*)-6-methoxy-7-oxo-4a,5,6,7,8,9-hexahydro-2H-benzocycloheptene-3,4-dicarboxylate, C₁₆H₂₀O₆, (II), (3aS*,9R*,10aS*,10bR*)-9-methoxy-2-oxa-1,3a,4,6,7,8,9,10,10a,10b-decahydro-3H-cyclohepta[e]indene-1,3,8-trione, C₁₄H₁₆O₅, (III), and (1S*,2R*,9S*,10aR*)-9-methoxy-8-oxo-1,2,3,5,6,7,8,9,10,10a-decahydrobenzocyclooctene-1,2-dicarboxylic acid, C₁₅H₂₀O₆, (IV), have been crystallographically characterized, allowing the determination of the relative configuration of the stereogenic centres. The poor quality of the dicarboxylic acid crystals necessitated the use of synchrotron radiation.

Formula: C₁₆H₂₀O₆, C₁₆H₂₀O₆, C₁₄H₁₆O₅ and C₁₅H₂₀O₆

Online 13 November 2001


	Structure factor file (CIF format) (176.3 kbytes) Contains datablock I

	Structure factor file (CIF format) (175.8 kbytes) Contains datablock II

	Structure factor file (CIF format) (142.2 kbytes) Contains datablock III

	Structure factor file (CIF format) (133.4 kbytes) Contains datablock IV

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