Structure of 3-(2-Hydroxy-4-methylphenyl)-3-phenylphthalide

C21H1603, M r = 316.36, monoclinic, P2,/n, a=8.099 (2), b= 11.178(3), c= 18.524(6)A, fl= 99.01 (2) °, V= 1656.3 (8)/~k 3, Z = 4, D m = 1.26, D x = 1.268 Mg m -3, 2(Mo Ka) = 0.71069 ~, /~ = 0.091 mm -~, F(000) = 664, T= 293 K. Final R = 0.037 for 1514 unique observed reflections. The geometry of the five-membered ring is generally comparable to other y-lactones. The tetrahedral sym- metry at the central tetra-substituted C atom is distorted by its association with the fused-ring system