title: Bis(phenyl-phospho-nic) anhydride.
abstract: The asymmetric unit of the title compound, C(12)H(12)O(5)P(2), contains four independent mol-ecules, generating two dimers via pairs of inter-molecular O-H⋯O hydrogen bonds, forming R(2) (2)(8) rings. The two aryl rings of each mol-ecule form dihedral angles of 108.6 (1), 103.2 (1), 12.5 (2) and 8.1 (2)° in the four mol-ecules.
authors.affiliation: Department of Chemistry, University of St Andrews, Fife KY16 9ST, Scotland.
authors.forename: Yang
authors.initials: Y
authors.lastname: Li
authors.forename: Guoxiong
authors.initials: G
authors.lastname: Hua
authors.forename: Alexandra M Z
authors.initials: AM
authors.lastname: Slawin
authors.forename: J Derek
authors.initials: JD
authors.lastname: Woollins