Li-Zhuang Chen

Synthesis of Enaminones in Aqueous Media Using Catalytic Dilute HCl

Abstract A green and convenient approach to the synthesis of β-enaminones from aromatic amines and 5-substituted-1,3-cyclohexanedione in the presence of dilute hydrochloric acid (30 mmol/L) as a catalyst in solvent-free media is described. This method provides several advantages such as environmental friendliness, low cost, good yields, and simple workup procedure.

4-Carbamoylpyridinium perchlorate.

In the cation of the title compound, C6H7N2O+·ClO4 −, the amide group is oriented at a dihedral angle of 10.41u2005(17)° to the benzene ring. The crystal structure is stabilized by intermolecular N—H⋯O hydrogen bonding.

2-[(R)-Hydr-oxy(6-methoxy-quinolinium-4-yl)meth-yl]-8-vinyl-1-azoniabicyclo-[2.2.2]octane tetra-chloridoferrate(III) chloride monohydrate.

In the title salt, (C20H26N2O2)[FeCl4]Cl·H2O, the FeIII atom exists in a tetrahedral coordination environment. The cation, anions and water molecules are linked by N—H⋯Cl, O—H⋯Cl and O—H⋯O hydrogen bonds into a layer network.

Ethyl-enediammonium dichloro-iodide chloride.

The asymmetric unit of the crystal structure of the title compound, C2H10N2 2+·Cl2I−·Cl−, contains two ethylenediammonium cations, two [ICl2]− anions and two Cl− anions, of which one cation, one [ICl2]− anion and one Cl− anion have site symmetry 2, with the mid-point of the C—C bond of the cation, the I atom of [ICl2]− anion and the Cl− anion located on the twofold rotation axes. The two independent cations show different conformations, the N—C—C—N torsion angles being 160.1u2005(2) and −73.1u2005(4)°. The crystal structure is stabilized by extensive intermolecular N—H⋯Cl hydrogen bonding.

Dimorpholinium tetra­chlorido­cobaltate(II)

In the title molecular salt, (C4H10NO)2[CoCl4], the morpholinium cations adopt chair conformations and the tetrachloridocobaltate(II) anion is significantly distorted from regular tetrahedral geometry [Cl—Co—Cl = 102.183u2005(19)–117.59u2005(2)°]. The Co—Cl bond lengths for the chloride ions not accepting hydrogen bonds are significantly shorter than those for the chloride ions accepting such bonds. In the crystal, the components are linked by N—H⋯O and N—H⋯Cl and bifurcated N—H⋯(O,Cl) hydrogen bonds to generate (100) sheets.

CCDC 845360: Experimental Crystal Structure Determination

Related Article: Hong Shu, Ning-Shu Yu, Guo-Lan Xie, Li-Zhuang Chen|2011|Acta Crystallogr.,Sect.E:Struct.Rep.Online|67|o2304|doi:10.1107/S1600536811031679

2-[(4-Meth­oxy­anilino)meth­yl]phenol

In the title compound, C14H15NO2, the dihedral angle between the two benzene rings is 71.10u2005(5)°. In the crystal, molecules are linked by intermolecular N—H⋯O, and O—H⋯N hydrogen bonds into a chain running parallel to the b axis.

2-[(4-Chloro-anilino)meth-yl]phenol.

In the title compound, C13H12ClNO, the dihedral angle between the two benzene ring planes is 68.71u2005(8)°. In the crystal, molecules are linked by pairs of O—H⋯N hydrogen bonds into inversion dimers, which are further linked by intermolecular N—H⋯O interactions into a chain running parallel to the a axis.

1,4-Diazo­niabicyclo­[2.2.2]octane tetra­chloroiodate(III) chloride

In the title compound, C6H14N2 2+·Cl4I−·Cl−, the dication and the anions lie on special positions. The dication has mm2 symmetry with two bonded C atoms and the two N atoms located on a crystallographic mirror plane parallel to bc, and with a mirror plane parallel to ab passing through the mid points of the three C—C bonds. In the square-planar Cl4I− anion, two Cl atoms and the I atom are located on the mm2 axis; the other two Cl atoms are disordered over two postions of equal occupancy (0.25) across the mirror parallel to the ab plane. The Cl− anion is located on the mm2 axis. The crystal structure is stabilized by intermolecular N—H⋯Cl hydrogen bonds.

9-(4-Chloro­phen­yl)-3,6-diphenyl-1,2,3,4,5,6,7,8-octa­hydro-9H-xanthene-1,8-dione

In the title compound, C31H25ClO3, the central ring of the xanthene core shows a shallow boat conformation, while the outer six-membered rings display envelope conformations. The dihedral angle between the outer aromatic rings is 88.1u2005(3)° and the dihedral angles between the chlorobenzene ring and the two phenyl rings are 69.5u2005(2) and 69.6u2005(2)°.