2,3-DIHYDRO-2',3'-EPOXY-8-METHOXYSPIRO[4H-1-BENZOPYRAN-4,1'-CYCLOHEXANE]

2,3-Dihydro-2',3'-epoxy-8-methoxyspiro[4H-1-benzopyran-4,1'-cyclohexane], C15H18O3, M(r) = 246.3, orthorhombic, Pbcn, a = 26.085(7), b = 7.211 (2), c = 13.653 (6) angstrom, V = 2568 (3) angstrom3, Z = 8, D(x) = 1.274 Mg m-3, lambda(Cu K-alphaBAR) = 1.5418 angstrom, mu = 0.67 mm-1, F(000) = 1056, T = 295 K, R = 0.048 for 1273 unique reflections. Both six-membered rings which share the spiro C atom are approximately 1,2-diplanar (sofa conformation) while the aromatic ring is planar. Owing to steric hindrance, one C-C bond formed by the spiro C atom is slightly longer than usual [1.560 (5) angstrom], but one of its neighbours in the heterocycle measures only 1.452 (5) angstrom. The structure can be regarded as constituted of layers of molecules which spread out approximately along the planes x = +/- 1/8 and +/- 3/8.