N. Schormann et E. Egert, A FULLY CYCLO-SUBSTITUTED CYCLOHEXANE, Acta crystallographica. Section C, Crystal structure communications, 52, 1996, pp. 2254-2256
ioxahexaspiro[2.0.3.0.2.0.3.0.2.0.3.0]heneicosane, C18H24O3, is mirror
-symmetric with alternating three- and four-membered rings. Its struct
ure agrees well with that of the parent hydrocarbon. Notable features
are the strongly alternating bond angles within the cyclohexane ring a
nd the differing bond lengths within the cyclobutane rings.