The structure of the title ionic copper(II) compound, (C(13)H(15)N(2))(2)[CuBr(4)], is built up of isolated 1,3-diallyl-benzimidazolium cations and [CuBr(4)](2-) anions which are inter-connected by electrostatic inter-actions. Differences in packing of the heterocyclic cores results in a different structure compared with earlier investigated chloride and bromide analogues.

(Z)-2-Enynyl-2-hydroxy-imidazolidine-4,5-diones 2 are synthesized for the first time via Cu(I)-mediated (Z)-selective geminal coupling among two molecules of terminal alkynes, carbodiimides, and oxalyl chloride. Further transformation of 2a is performed to yield a highly functionalized spiro heterocyclic compound 5.

α,β-Unsaturated carbonyl compounds are versatile intermediates in the synthesis of pharmaceuticals and biologically active compounds. Here, we report the discovery and application of Pd(DMSO)(2)(TFA)(2) as a catalyst for direct dehydrogenation of cyclohexanones and other cyclic ketones to the corresponding enones, using O(2) as the oxidant. The substrate scope includes heterocyclic ketones and ...

The coordination geometry about the Pd centre in the title compound, [Pd(C(40)H(42)N(5))Cl], is approximately square-planar. The CNC pincer-type N-heterocyclic carbene ligand binds to the Pd atom in a tridentate fashion by the amido N atom and the two carbene atoms and generates two six-membered chelate rings, completing the coordination.

The title compound, C(12)H(11)NO(3)S, synthesized by the reaction of benzene sulfonyl chloride with para-amino-phenol, is of inter-est as a precursor to biologically active sulfur-containing heterocyclic compounds. The structure is stabilized by N-H⋯O and O-H⋯O hydrogen bonds.

The title compound, C(13)H(20)O(4)Si(2), is a siloxane-functionalized norbornane anhydride. Both five-membered heterocyclic rings of the mol-ecule have a planar structure, whereas the two five-membered aliphatic rings assume envelope conformations. Weak inter-molecular C-H⋯O hydrogen bonding is present in the crystal structure.

In the title compound, C(8)H(6)ClNO(2), the conformation of the six-membered heterocyclic ring is close to screw boat and the mol-ecules are linked via inter-molecular N-H⋯O hydrogen bonds along the b axis.

In the title compound, C(16)H(13)ClN(2)S, the dihedral angle between the 4-chloro-benzaldehyde moiety and the heterocyclic five-membered ring is 7.21 (17)°. In the crystal, mol-ecules are linked by weak C-H⋯π inter-actions, generating [100] chains.

In the mol-ecule of the title compound, C(16)H(14)O(2), the aromatic rings are oriented at a dihedral angle of 78.49 (3)°. The heterocyclic ring adopts a twist conformation. In the crystal structure, inter-molecular C-H⋯O hydrogen bonds link the mol-ecules into chains along the c axis.

In the title compound, C(16)H(13)ClN(2)S, the mean planes fitted through all non-H atoms of the heterocyclic five-membered and the benzene rings are oriented at a dihedral angle of 5.19 (7)°. In the crystal, a weak C-H⋯π inter-action occurs, along with weak π-π inter-actions [cenroid-centroid distance = 3.7698 (11) Å].