Crystal and molecular structure of 10,10-dimethyl-3,4-dioxatricyclo-[5.2.1.0]decane-2-spiro-2′-adamantane and a comparison of C–O and O–O bond lengths in small rings as a function of ring size
- 1 January 1979
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 2
- No. 2,p. 126-129
- https://doi.org/10.1039/p29790000126
Abstract
The crystal structure of the title compound (IV) formed by reaction of singlet oxygen with camphenylideneadamantane (I) shows it to be a 1,2-dioxolan in which the camphane framework has rearranged to norbornane. Crystals are orthorhombic, space group P212121, with a= 23.17(2), b= 9.76(1), c= 6.74(1)Å, Z= 4; the structure was refined to R 0.062 based on 783 counter reflections. From comparisons with other structures it is shown that in small-ring cyclic peroxides and related molecules the C–O and O–O follow the trend of C–C bonds in being longer in four- than in either three- or five-membered rings. However the differences in bond length with ring size appear to be larger for C–O and smaller for O–O bonds by comparison with C–C bonds.Keywords
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