Acta Cryst. (2004). E60, o1935-o1936  [ doi:10.1107/S1600536804024390 ]

Dibenzophospholanic acid anhydride

A. Decken, E. D. Gill and F. Bottomley

Abstract: The title compound [alternatively called 9,9'-oxydi(9-phosphafluoren-9-one) or bis(5-hydroxy-5-oxodibenzo-5H-phosphole) anhydride], C₂₄H₁₆O₃P₂, is the only example of a crystallographically characterized phospholanic acid anhydride. The molecule is highly twisted as evident by its O=PP=O angle [72.9  (1)°].

Online 9 October 2004

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