title: 3,3,9,9-Tetra-phenyl-2,4,8,10-tetra-oxa-spiro-[5.5]undeca-ne.
abstract: In the title compound, C(31)H(28)O(4), the asymmetric unit contains two crystallographically independent mol-ecules. In these two mol-ecules, the four dihedral angles between each pair of phenyl rings on the same C atoms are 75.4 (1), 83.0 (1), 85.0 (1) and 80.4 (2)°. All of the nonplanar six-membered heterocycles adopt chair conformations. Inter-molecular C-H⋯π and weak C-H⋯O inter-actions link the mol-ecules and are effective in the stabilization of the crystal structure.
authors: Key Laboratory of Fine Chemical Engineering, Changzhou University, Changzhou 213164, Jiangsu, People's Republic of China.
authors: Xiaoqiang
authors: X
authors: Sun
authors: Liang
authors: L
authors: Chen
authors: Yan
authors: Y
authors: Jiang
authors: Zhengyi
authors: Z
authors: Li
references: Acta Crystallogr A. 2008 Jan;64(Pt 1):112-22
references: 18156677
references: Molecules. 2008 Nov 17;13(11):2848-58
references: 19015624