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Acta Cryst. (2003). E59, o1554-o1555  [ doi:10.1107/S160053680302066X ]

Ethyl (O-B)-5-(difluoroboryloxy)tricyclo[,8]undecane-4-carboxylate

G. Argay, A. Kálmán, G. Bernáth and Zs. Cs. Gyarmati

Abstract: The title compound, C14H19BF2O3, can be described as a resonance hybrid. The entering BF2 moiety interacts with the C=O (oxo) groups of the parent compound, 5-(ethoxycarbonyl)adamantan-4-one, generating two conjugated double bonds in the six-membered difluorodioxoborane ring. In spite of the conjugation between the multiple bonds, the tetrahedral configuration of the B atom gives rise to a non-planar conformation of the six-membered ring, which assumes a state intermediate between the boat and sofa forms.

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