1,2-Bis(di-2-pyridylphosphino­yl)ethane

The crystal structure of the title compound, C22H20N4O2P2, consists of two independent half-mol­ecules, both of which lie on crystallographic inversion centres. There are no significant differences between the two mol­ecules

Syntheses of spiro[cyclopropane-1,3\u27-oxindole]-2-carboxylic acid and cyclopropa[c]quinoline-7b-carboxylic acid and their derivatives

The synthesis of spiro[cyclopropane-1,3′-oxindole]-2-carboxylic acid, including novel 3-(2- and 3-pyridyl)-substituted analogues and the novel cyclopropa[c]quinoline-7b-carboxylic acid and their ester and amide derivatives is described. These syntheses involve diastereoselective cyclopropanation reactions of methyl 2-(2-nitrophenyl)acrylate and (3E)-(pyridin-2-ylmethylene)- and (3E)-(pyridin-3-ylmethylene)-1,3-dihydro-2H-indol-2-one with ethyl (dimethyl sulfuranylidene) acetate (EDSA). The synthesis of methyl cyclopropa[c]quinoline-7b-carboxylate involves a regioselective reductive cyclization of a nitro-diester precursor. The relative stereochemistry of key compounds has been determined by single-crystal X-ray structural analysis

Synthesis of (+/-)epipentenomycin I and III

A synthesis of (±) epipentenomycin I and III is reported from a regioselective epoxidation of racemic 3-hydroxy- and 3-acetoxy-2-methylene-4-cyclopentenone, respectively, with dimethyldioxirane followed by hydrolytic ring-opening of the resulting epoxide

Chlorido(1,3-dimethyl­thio­urea-κS)bis­(triphenyl­phosphine-κP)copper(I) acetonitrile hemisolvate

The title compound, [CuCl(C3H8N2S)(C18H15P)2]·0.5CH3CN, was prepared by the reaction of copper(I) chloride with 1,3-dimethyl­thio­urea (dmtu) and triphenyl­phosphine (PPh3) in acetonitrile. The CuI atom has a distorted tetra­hedral environment formed by two P atoms from triphenyl­phosphine, one S atom from the dmtu ligand and one Cl atom. In addition, the mol­ecules exhibit intra- and inter­molecular N—H⋯Cl inter­actions

[2-(Dimethyl­amino)­ethanol-κ2 N,O][2-(dimethyl­amino)­ethano­lato-κ2 N,O]iodidocopper(II)

The title compound, [Cu(C4H10NO)I(C4H11NO)], was obtained unintentionally as the product of an attempted synthesis of a Cu/Zn mixed-metal complex using zerovalent copper, zinc(II) oxide and ammonium iodide in pure 2-(dimethyl­amino)­ethanol, in air. The mol­ecular complex has no crystallographically imposed symmetry. The coordination geometry around the metal atom is distorted square-pyramidal. The equatorial coordination around copper involves donor atoms of the bidentate chelating 2-(dimethyl­amino)­ethanol ligand and the 2-(dimethyl­amino)­ethano­late group, which are mutually trans to each other, with four approximately equal short Cu—O/N bond distances. The axial Cu—I bond is substanti­ally elongated. Inter­molecular hydrogen-bonding inter­actions involving the –OH group of the neutral 2-(dimethyl­amino)­ethanol ligand to the O atom of the monodeprotonated 2-(dimethyl­amino)­ethano­late group of the mol­ecule related by the n-glide plane, as indicated by the O⋯O distance of 2.482 (12) Å, form chains of mol­ecules propagating along [101]

(Acetyl­acetonato)(dicyanamido)(1,10-phenanthroline)copper(II) dihydrate

In the title compound, [Cu(C5H7O2)(C2N3)(C12H8N2)]·2H2O, the CuII atom is five-coordinated in a square-pyramidal geometry with two acetyl­acetonate O and two phenanthroline N atoms forming the base. The apical position is occupied by the central N atom of the dicyanamide ligand. The dicyanamide N atoms are each involved in hydrogen bonds to water mol­ecules. There are also hydrogen bonds between both the water mol­ecules and their centrosymmetric pairs, creating a hydrogen-bonded chain along the b-axis direction