No abstract

In the title compound, C17H20Cl2NO4P, the P atom is bonded in a distorted tetra­hedral environment. The dihedral angle between the two benzene rings is 80.5 (1)°. In the crystal structure, inter­molecular O—H⋯O and N—H⋯O hydrogen bonds link pairs of mol­ecules into centrosymmetric dimers. These dimers, are in turn, linked by weak inter­molecular C—H⋯O hydrogen bonds into one-dimensional chains along [010]. Additional stabilization is provided by very weak C—H⋯Cl inter­actions.

In the title compound, C19H17N2O3P, the six-membered 1,3,2-oxaza­phospho­rine ring adopts a twist-boat conformation with the phosphoryl O atom in an equatorial position. The P=O(oxide) bond length is 1.457 (1) Å and the average value of the P—O distances is 1.588 Å. The crystal structure is stabilized by C—H⋯O and C—H⋯π inter­actions.

In the title compound, C18H11Cl2O3PS, the seven‐membered phosphepine ring exhibits a distorted‐boat conformation, with the phosphor­yl sulfide group axial and the dichloro­phen­oxy group equatorial. Fusion of the phosphepine ring to the biphen­yl system causes strain, as evidenced by both widening and compression of the endocyclic angles in the heterocyclic ring. The P=S bond length is 1.8939 (12) Å and the planar dichloro­phen­yl ring is oriented at an angle of 28.70 (6)° to the phosphepine ring.

In the title compound, C19H17N2O2P, the six-membered 1,3,2-oxaza­phosphinine ring adopts a boat conformation with the phosphoryl O atom in an equatorial position. The dihedral angle between the 6-methyl-2-pyridyl and phenyl groups is 75.5 (1)°. These substituents are trans to each other, and are oriented at angles of 57.2 (1) and 74.8 (1)°, respectively, to the benzene ring. The crystal structure is stabilized by intra- and inter­molecular hydrogen bonds. The phosphoryl O atom participates in inter­molecular C—H⋯O inter­actions with the neighbouring mol­ecules, forming centrosymmetric R 2 2(14) dimers.