The crystallographically related five-membered rings in chiral spiro(4,4)nonane-1,6-dione adopt a conformation intermediate between envelope and half-chair form but closer to the latter; the angle between the two C![[double bond, length as m-dash]](https://www.rsc.org/images/entities/char_e001.gif)
O vectors is 84°.
C. Altona, R. A. G. de Graaff, C. H. Leeuwestein and C. Romers, J. Chem. Soc. D, 1971, 1305 DOI: 10.1039/C29710001305
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