The stereochemistries of the title compounds, both C(16)H(24)Cl(2)O, have been established by X-ray diffraction. In both structures, the seven-membered ring adopts the same conformation, whereas the six-membered ring shows an envelope conformation in the epoxydodecane structure and a boat conformation in the dodecan-9-one structure.

The title compound, diaquabis{2‐[(5‐methylpyrazol‐3‐yl)methyl]benzimidazole}cobalt(II) dichloride dihydrate acetone solvate, [Co(C12H12N4)2(H2O)2]Cl2·2H2O·C3H6O, is composed of the cationic complex [Co(C12H12N4)2(H2O)2]2+, with two chloride ions, two water molecules and one acetone molecule. The cobalt ion, linked to two water molecules and four N atoms of the deformed ligand, exhibits a slightly distorted octahedral coordination.

The structures of dichloro[2-[(5-methyl-1H-pyrazol-3-yl-kappaN(2))methyl]-1H-1,3-benzimidazole-kappaN(3)]copper(II), [CuCl(2)(C(12)H(12)N(4))], and di-mu-chloro-bis(chloro[2-[(5-methyl-1H-pyrazol-3-yl-kappaN(2))methyl]-1H-1,3-benzimidazole-kappaN(3)]cadmium(II)), [Cd(2)Cl(4)(C(12)H(12)N(4))(2)], show that these compounds have the structural formula [ML(Cl)(2)](n), where L is 2-[(5-methylpyrazolyl)methyl]benzimidazole. When M is copper, the complex is a monomer (n = 1), with a tetrahedral coordination for the Cu atom. When M is cadmium (n = 2), the complex lies about an inversion centre giving rise to a centrosymmetric dimer in which the Cd atoms are bridged by two chloride ions and are pentacoordinated.

Key indicatorsSingle-crystal X-ray study T = 293 K Mean '(C±C) = 0.005 A Ê R factor = 0.046 wR factor = 0.124 Data-to-parameter ratio = 14.0For details of how these key indicators were automatically derived from the article, see http://journals.iucr.org/e.

In the paper by Sbai, Dakir, Auhmani, El Jamili, Akssira, Benharref, Kenz & Pierrot [http://scripts.iucr.org/cgi-bin/paper?gg1115], there is an error in the author list. The correct list of authors is given above.