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Photolysis of a 2-(2-iso­propyl-benzoyl)­benzoate ester derivative in an oxy­gen-free environment results in the liberation of the alcohol from the ester and formation of the title spiro­lactone, C20H20O2. The mol­ecule of the title compound adopts the syn configuration with respect to the benzene rings, with a dihedral angle of 87.19 (5)° between the benzo­cyclo­butene and isobenzo­furan­one ring planes. The cyclo­butene ring is nearly planar, giving rise to ring distortion, as manifested in the bond distances and angles.
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Document Type: Research Article

Publication date: December 1, 2004

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