Oxidation of (+) sabinol, (1S,3R,5S) 1 isopropyl 4 methylidenebicyclo[3.1.0]hexan 3 ol,
by active MnO2 afforded not the expected sabinone but only its [4+2] cyclodimer. The mo
lecular structure of the latter was established by X ray diffraction analysis. The 1H and 13C NMR
spectra of this cyclodimer were interpreted using 2D NMR spectroscopy.
