Crystal and molecular structure of 7-oxabicyclo[2,2,1]hept-5-ene-2,3-exo-dicarboxylic anhydride
- 1 January 1972
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 2
- No. 8,p. 934-937
- https://doi.org/10.1039/p29720000934
Abstract
The crystal and molecular structure of the title compound (I) has been determined by three-dimensional X-ray analysis from 750 non-zero reflexions measured photographically. The compound crystallizes in the orthorhombic system, space group P212121 with a= 7·00 ± 0·02, b= 18·93 ± 0·03, and c= 5·38 ± 0·01 Å, Z= 4. The crystal structure has been solved by the symbolic addition procedure applied to non-centrosymmetric crystals, and refined by least-squares calculations to R 0·087. The compound has the exo-conformation. The introduction of an oxygen atom in position 7 of the norbornene skeleton produces interesting modifications in some bond distances and angles.Keywords
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