Volume 69 Received 23 January 2013 | ||||||||||
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aInstitut für Chemie neuer Materialien, Organische Materialchemie, Universität Osnabrück, Barbarastrasse 7, D-49069 Osnabrück, Germany, and bInstitut für Chemie neuer Materialien, Strukturchemie, Universität Osnabrück, Barbarastrasse 7, D-49069 Osnabrück, Germany
Correspondence e-mail: hreuter@uos.de
The title compound (itaconic anhydride), C5H4O3, consists of a five-membered carbon-oxygen ring in a flat envelope conformation (the unsubstituted C atom being the flap) with three exocyclic double bonds to two O atoms and one C atom. In contrast to the bond lengths, which are very similar to those in itaconic acid in its pure form or in adducts with other molecules, the bond angles differ significantly because of the effect of ring closure giving rise to strong distortions at the C atoms involved in the exocyclic double bonds. In the crystal, C-H
O interactions link the molecules, forming an extended three-dimensional network.
For the structure of the pure acid, see: Harlow & Pfluger (1973
) and for the structure of the acid in combination with 2,2'-dipyridyl-N,N'-dioxide or urea, see: Smith et al. (1997
); Baures et al. (2000
). For the structure of succinic anhydride, see: Ferretti et al. (2002)
. For the preparation of the anhydride, see: Choudhary (2004
); Kempf (1909
) and for its polymerization, see: Otsu & Yang (1991
).
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Data collection: APEX2 (Bruker, 2009
); cell refinement: SAINT (Bruker, 2009
); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008
); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008
); molecular graphics: DIAMOND (Brandenburg, 2006
) and Mercury (Macrae et al., 2008
); software used to prepare material for publication: SHELXTL (Sheldrick, 2008
).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: GG2110 ).
We thanks the Deutsche Forschungsgemeinschaft and the Government of Lower Saxony for their financial support in the acquisition of the diffractometer.
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![[ChemPort]](../../../../../../logos/chemportborder.gif)
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![[ISI]](../../../../../../logos/isiborder.gif)
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![[ChemPort]](../../../../../../logos/chemportborder.gif)
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![[details]](../../../../../../j/graphics/details.gif)
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![[ISI]](../../../../../../logos/isiborder.gif)
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![[details]](../../../../../../a/graphics/details.gif)
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