STRUCTURE OF 1,2-BIS(SPIRO[2.3]HEX-4-ENE-4-YL)ETHANE

C14H18 (1), M(r) = 186.3, monoclinic, P2(1)/c, a = 9.285(6), b = 5.373 (2), c = 11.981(6) angstrom, beta = 112.09(4)-degrees, V = 553.8(1) an gstrom, Z = 2, D(x) = 1.12 g CM-3, lambda(Mo Kalpha) = 0.71073 angstro m, mu = 0.6 cm-1, F(000) = 204, T = 183 K, R = 0.050, wR = 0.049 for 8 71 observed reflections. The molecule occupies a special position at a n inversion centre. The bond lengths in the three-membered ring are un disturbed due to the opposing influence of the double-bond pi-system c onjugation with the Walsh molecular orbital of cyclopropane and strain due to a spiro conjunction of two small rings.