1,3,3-Trimeth­yl-6'-(4-phenyl­piperazin-1-yl)-2,3-dihydro­spiro­[1H-indole-2,3'-3H-naphth[2,1-b][1,4]oxazine]

The title compound, C₃₂H₃₂N₄O, a spiro­oxazine modified with a fused phen­yl-piperazin­yl-naphthalene moiety, has been characterized by X-ray crystallographic techniques. The piperazine ring is in a chair conformation, while the oxazine and pyrrolidine rings adopt envelope conformations.

Acetonitrile­dichloro­(1,4,7-triaza­cyclo­decane)cobalt(III) perchlorate

In the title compound, [CoCl₂(C₇H₁₇N₃)(C₂H₃N)]ClO₄, the Co³⁺ ion is six-coordinated by three N atoms from the 1,4,7-triaza­cyclo­deca­ne (tacd) ligand, two chloride anions and one N atom of the acetonitrile group, giving a distorted octa­hedral geometry. The cation and anion both have crystallographic mirror symmetry. Inter­molecular hydrogen bonds link the ions into a three-dimensional network.

7-Methyl-1-(β-D-erythro-pento­furan­osyl)-1H-benzimidazol-2(3H)-one

The title nucleoside, C₁₃H₁₆N₂O₅, was prepared and characterized by X-ray crystallographic tech­niques. The crystal structure determination reveals that the furan­ose ring adopts a C2′-endo conformation, while the orientation of the benz­imidazole moiety with respect to the sugar moiety is mid-anti. The crystal structure is stabilized by intermolecular O—H...O and N—H...O hydrogen bonds.

8-Bromo-6-chloro­-1',3',3',5'-tetra­meth­ylspiro­[2H-1-benzopyran-2,2'-indoline]

In the title compound, C₂₀H₁₉BrClNO, the pyrrolidine ring adopts an envelope conformation, while the pyran ring is in a twist-boat form.

1,2-Di­methyl-4,5-bis­(phenyl­ethynyl)­benzene

The title compound, C₂₄H₁₈, possesses a twofold rotation axis, which bisects the 1,2-di­methyl­benzene ring. In the crystal structure, all three benzene rings are essentially coplanar, the angle between the central and terminal rings being 3.8 (1)°.

2,2,6,6-Tetra­methyl­piperidin-4-ol

The mol­ecule of the title compound, C₉H₁₉NO, lies on a mirror plane. Inter­molecular N—H...O and O—H...N hydrogen bonds are observed in the crystal structure.