title: 4-(Diphenyl-phosphan-yl)benzoic acid.
abstract: In the title compound, C(19)H(15)O(2)P, the dihedral angles between the benzoic acid ring and the phenyl rings are 75.64 (7) and 80.88 (7)°; the dihedral angle between the phenyl rings is 81.35 (7)°. In the crystal, inversion dimers linked by pairs of O-H⋯O hydrogen bonds generate R(2) (2)(8) loops between the head-to-head carb-oxy-lic acid groups.
authors: Research Center for Engineering Technology of Polymeric Composites of Shanxi Province, School of Materials Science and Engineering, North University of China, Taiyuan 030051,  People's Republic of China.
authors: Pei-Hua
authors: PH
authors: Zhao
authors: Fu-Yu
authors: FY
authors: Sun
authors: Jun-Jie
authors: JJ
authors: Liu