Acta Cryst. (2005). E61, o3034-o3035  [ doi:10.1107/S1600536805026565 ]

rac-(1R,1aR,4S,6aS)-Ethyl 4-carboxy-1,1a,2,3,4,5,6,6a-octahydrocyclopropa[f]indene-1-carboxylate

P. G. Jones, H. Hopf and Z. Hussain

Abstract: In the title compound, C₁₄H₁₈O₄, the central six-membered ring subtends interplanar angles of 3.5 (1), 78.4 (1) and 78.73 (4)°, respectively, with the five-membered ring, the cyclopropane ring and the ester side chain. The C-C bond distal to the carbonyl substituent is shortened compared to the other two bonds of the cyclopropane moiety. The carboxylic acid groups form inversion-symmetric dimers by hydrogen bonding.

Online 27 August 2005

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