Benzilic acid: a monoclinic polymorph.

The title compound, CHO, is an α-hy-droxy-carb-oxy-lic acid whose ortho-rhom-bic polymorph has been reported earlier [Qiu (2007 ▸). , , 1819-1824]. The asymmetric unit contains two complete mol-ecules.

Tri-phenyl-phospho-nium tri-chlorido-(tri-phenyl-phosphane-κ)cobaltate(II) benzene disolvate.

The solvated title compound, (CHP)[CoCl(CHP)]·2CH, is the tri-phenyl-phospho-nium salt of an anionic Co chlorido coordination compound; the asymmetric unit features an ion-pair and two benzene solvent molecules. One of the solvent mol-ecules shows rotational disorder. C-H⋯Cl and P-H⋯Cl contacts connect the individual constituents into infinite chains extending parallel to [010].

Tris(4-chloro-phen-yl) phosphate.

The title compound, CHClOP, is the symmetric phosphate derived from -chloro-phenol and phospho-ric acid. Two of the three aromatic moieties adopt -orientation towards the P=O bond while the last chloro-phenol ring is pointing away from this bond. In the extended structure, C-H⋯O bonds connect the individual mol-ecules into sheets lying perpendicular to the crystallographic axis.

-Hy-droxy-isovaleric acid.

The title compound (systematic name: -2-hydroxy-3-methylbutanoic acid), CHO, is the constitutional isomer of α-hy-droxy-butanoic acid. In the crystal, hydrogen bonds involving the alcoholic hydroxyl group give rise to centrosymmetric dimers that are extended to sheets perpendicular to the crystallographic axis.

[1,1'-Bi-cyclo-hexa-ne]-1,1'-diol.

The title compound, CHO, is a symmetric diol derived from the pinacol coupling of cyclo-hexa-none. The asymmetric unit contains three complete mol-ecules. The cyclo-hexane moieties adopt chair conformations.