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In the title compound, C 31 H 28 O 4 , the asymmetric unit contains two crystallographically independent mol­ecules. In these two mol­ecules, 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. Inter­molecular C—H⋯π and weak C—H⋯O inter­actions link the mol­ecules and are effective in the stabilization of the crystal structure.

3,3,9,9-Tetraphenyl-2,4,8,10-tetraoxaspiro[5.5]undecane