Crystal structure of (1a, 8a, 9b, 12b)-1,8-diphenyl-13-oxatetracyclo-[6.4.1.0 2,7.0 9,12] trideca-2,4,6,10-tetraene, c24h18o

C24H18O, orthorhombic. Pbca (No. 61), a + 19.8704 A. b = 16.78(2) A, c = 10.520(6) A, V = 3507.6 A3, Z = 8, Rgt(F) = 0.057, wRref(F2) = 0.147, T = 293 K. Source of material. Colourless crystals were obtained from the slow evaporation of a methanol solution of the compound [1]. Experimental details. The C-bound H atoms were placed in their geometrically calculated positions and included in the final refinement in the riding model approximation. Discussion. The structure determination shows that the molecule approximates mm symmetry and that the phenyl groups are oriented in to the same side of the molecule as the 03 atom.