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The structure of 2C16H36N+·C8H4O4 2−·C34H30N8O4, comprises tapes of encapsulated hydrogen-bonded isophthalate anions which are arranged into parallel sheets interleaved with tetrabutylammonium layers; each of the two independent neutral molecules is disposed about a centre of inversion.

Crystals of the mixed halogen complex, fac-(bromo/chloro)tricarbonyl[ 1,3-bis(diphenylphosphino) propane] manganese( I), fac-[MnBr0.3Cl0.7(C30H26O3P2)(CO)(3)], were obtained from a prolonged recrystallization attempt of [MnBr{Ph2P(CH2)(3)PPh2}( CO)(3)] from CHCl3/hexane solution at 263 K. Common coordinates are found for all but the halogen atoms in the disordered structure, but the Mn-X vectors differ by 3.5 (5)degrees and the M - X bond lengths differ by 0.10 ( 1) Angstrom.

The title compound, C16H36N+.H2PO4−.1.33CH2Cl2, exists as infinite one-dimensional di­hydrogen phosphate chains within cationic tetra­butyl­ammonium channels.

The crystal structure determination of the title compound, C13H15IO4, has allowed the relative stereochemistry between the tetrasubstituted C atoms on the tetrahydrofuran moiety to be confirmed. The title compound is a precursor of the ionophoric antibiotic Aplasmomycin. The compound is involved in both intra- and intermolecular hydrogen bonding, the latter link the molecules into chains running along thebaxis.

In the title compound, C6H6NO2+·NO3−·H2O, the nicotinium cation is essentially planar. N—H⋯O, O—H⋯O and C—H⋯O hydrogen bonds link the mol­ecules into layers parallel to the (10\overline{1}) plane.

In the crystal structure of the title compound, (C5H7N2)2[CoCl4], the CoII ion is coordinated by four chloride ions. The Co atom lies on a crystallographic twofold rotation axis. The structure is stabilized by an extensive network of N—H⋯Cl hydrogen bonds.

The receptor of the title compound, C14H36N+·Cl−·C20H14N4O6, binds a chloride anion via two N—H⋯Cl hydrogen bonds [N⋯Cl = 3.2367 (14) A and 3.3239 (15)°].

The crystal structure of the tetrabutylammonium salt of doubly deprotonated 4-aminomethyl(phenylamino)bis-(3,4-dichloro-5-phenylcarbamoyl-1H-pyrrole -2-carboxamide), 2C(16)H(36)N(+)• C32H22C14N6O42-, has been elucidated. The anion lies on an inversion centre and adopts a twisted S shape.

The title compound, C30H20N6O4Cl4.2C16H36N+·2Cl−·2C2H3N, contains two hydrogen-bonded chloride anions bound to 1,4-phenyl­ene-bis-(3,4-di­chloro-5-phenyl­carbamoyl-1H-pyrrole-2-carbox­amide) as the tetra­butyl­ammonium salt. There is also a short pyrrolic hydrogen bond (N⋯Cl = 3.068 (3) A), and two longer ones to the amino H atoms [N⋯Cl = 3.269 (3) A and 3.275 (3) A]. The neutral mol­ecule lies on an inversion centre situated at the centre of the central benzene ring.

The title compound, Ph2P(O)CH(Ph)CH2COOEt or C23H23O3P, (I), assembles into columns extending down the a axis, via C—H⋯O hydrogen bonds. Compound (I) was isolated as a by-product in studies related to the development of a novel cyclization reaction [Evans et al. (2002). Tetrahedron Lett. 43, 299–301] and was synthesized independently to confirm its structure.

The title compound, C8H12O4, is formed as a by-product in the preparation of the protected sugar 2,3-O-iso­propyl­idene-β-d-ribose under acid-catalysed conditions (H2SO4/acetone) from d-ribose [Fleetwood & Hughes (1999). Carbohydr. Res. 317, 204–209]. The absolute configuration was assigned on the basis of the known d-ribose configuration.

In the title compound, C27H36N2O6Si, the angle between the two least-squares planes of the nitro­phenyl groups is 34.65 (9)°. Owing to the presence of an approximate non-crystallographic mirror plane, the title compound is an example of an achiral mol­ecule crystallizing in a chiral space group.

In the title compound, C20H31NO3Si, the nitrophenyl groups of adjacent molecules overlap to form pi-pi-stacked pairs.

The title compound, C19H17NO2, forms dimeric aggregates in the solid state due to the pyrrole-NH–carboxyl-O hydrogen bonds.

The molecules of the title compound, C15H20O4, link via a single intermolecular hydrogen bond to form chains running along the b axis.

The asymmetric unit of the title compound, C15H19FO4, contains two independent mol­ecules that hydrogen bond to form dimers.

The hydrogen­sulfate ions of the title compound, C16H36N+·HSO4−, form hydrogen-bonded dimers.

The X-ray study of the title compound, C23H26O8, (I), confirmed the endo,exo-furo­furan­one structure of the important intermediate compound in the process of the total synthesis of (±)-epimagnolin A, which employs a new approach involving a highly diastereoselective C—H insertion reaction [Brown et al. (2001). Tetrahedron Lett. 42, 473–475].

The structure of the title compound, C3H3NO2S, comprises flat molecules that associateviaa single N—H...O interaction and a C—H...O close contact to the second O atom. Furthermore, 10% of the molecules have S and CH2interchanged, generating disorder.

The structure of the title compound, C32H22N6, comprises two unique molecules that associateviaN—H...N interactions to form a single convoluted hydrogen-bonded polymer chain. The dihedral angles between the indole rings and the substituted pyridyl rings are 13.43 (14) and 22.34 (12) Å.