title: 7-Phenyl-7H-dinaphtho-[2,1-b:1',2'-d]phosphole 7-oxide.
abstract: In the title compound, C(26)H(17)OP, the naphthyl ring systems are bent away from each other [dihedral angle = 30.81 (8)°]. In the crystal, weak inter-molecular C-H⋯O inter-actions link the mol-ecules into helical chains along the 2(1) screw axis.
authors: College of Chemistry and Chemical Engineering, Liaocheng University, Shandong 252059,  People's Republic of China.
authors: Lan
authors: L
authors: Yao
authors: Chang-Qiu
authors: CQ
authors: Zhao