1-(4-Chloro­phenyl)-2-[tris­(4-methyl­phenyl)-λ⁵-phosphanyl­idene]butane-1,3-dione

In the title ylide, C₃₁H₂₈ClO₂P [common name α-acetyl-α-p-chloro­benzoyl­methyl­enetri(p-tol­yl)phospho­rane], the dihedral angle between the 4-chloro­phenyl ring and that of the ylide moiety is 66.15 (10)°. The geometry around the P atom is slightly distorted tetra­hedral [angle range = 105.22 (8)–115.52 (9)°] and the carbonyl O atoms are syn-oriented with respect to the P atom. The ylide group is close to planar [maximum deviation from the least-squares plane = 0.006 (2) Å] and the P—C, C—C and C=O bond lengths are consistent with electron delocalization involving the O atoms.

1,3-Bis[(tert-butylsulfanyl)methyl]-2,4,6-trimethylbenzene

The complete mol­ecule of the title compound, C₁₉H₃₂S₂, is generated by crystallorgaphic twofold symmetry, with three C atoms lying on the axis. The C_ar—C—S—C (ar = aromatic) torsion angle is 156.2 (2) °. In the crystal, the mol­ecules are linked by very weak C—H...S inter­actions, generating [001] chains.

A second monoclinic polymorph of (E)-phen­yl(pyridin-2-yl)methanone oxime

The title compound, C₁₂H₁₀N₂O, a second monoclinic poly­morph of (E)-phen­yl(pyridin-2-yl)methanone oxime crystallizes in the space group P2₁/n (Z = 4). The previously reported polymorph [Taga et al. (1990). Acta Cryst. C46, 2241–2243] occurs in the space group C2/c (Z = 8). In the crystal, pairs of bifurcated O—H...(N,O) hydrogen bonds link the mol­ecules into inversion dimers. The dimers are linked by C—H...π inter­actions, forming a linear arrangement. The dihedral angle between the pyridine and phenyl rings is 67.70 (8)°.