Tetra­kis[μ-1,4-bis­(4,5-dihydro-1,3-oxazol-2-yl)benzene-κ2 N:N′]tetra­kis­(μ-methano­lato-κ2 O:O)bis­(μ-perchlorato-κ2 O:O′)tetra­copper(II) bis­(perchlorate)

The title tetra­nuclear CuII complex, [Cu4(C12H12N2O2)4(CH3O)4(ClO4)2](ClO4)2, is located around an inversion center. Each CuII atom is coordinated by two cis-O atoms from two bridging methano­late anions and two cis-N atoms from two bridging 1,4-bis­(4,5-dihydro-1,3-oxazol-2-yl)benzene (L) ligands in the basal plane, and is further coordinated by one O atom of the bridging perchlorate anion, forming a distorted square-pyramidal geometry. The Cu⋯Cu separations in the recta­ngular core are 2.9878 (11) and 6.974 (1) Å. In the asymmetric unit, there are two L ligands with a syn conformation. In one L ligand, the dihedral angles between the central benzene ring and the terminal 4,5-dihydro-1,3-oxazol-2-yl mean planes are 22.1 (4) and 33.1 (4)°, and in the other L ligand the corresponding dihedral angles are 29.3 (4) and 29.9 (4)°. The uncoordinated perchlorate anion is linked with the complex mol­ecules via weak C—H⋯O hydrogen bonds

Poly[[μ-1,4-bis­(4,5-dihydro-1,3-oxazol-2-yl)benzene-κ2 N:N′]di-μ-bromido-cadmium]

In the title coordination polymer, [CdBr2(C12H12N2O2)]n, the CdII ion, situated on an inversion centre, is coordinated by four bridging Br atoms and two N atoms from two 1,4-bis­(4,5-dihydro-1,3-oxazol-2-yl)benzene (L) ligands in a distorted octa­hedral geometry. The L ligand, which also lies across an inversion centre, bridges two CdII ions, forming layers parallel to (010)

Poly[[μ2-1,4-bis­(4,5-dihydro-1,3-oxazol-2-yl)benzene-κ2 N:N′]di-μ2-chlorido-cadmium]

In the title coordination polymer, [CdCl2(C12H12N2O2)]n, the CdII ion, situated on an inversion center, is coordinated by four bridging Cl atoms and two N atoms from two 1,4-bis­(4,5-dihydro-1,3-­oxazol-2-yl)benzene (L) ligands in a distorted octa­hedral geometry. Each L ligand also lies across an inversion center and bridges two CdII ions, forming infinite two-dimensional recta­ngular layers running parallel to (010)

Poly[(μ3-quinoline-6-carboxyl­ato-κ3 N:O:O′)silver(I)]

In the title coordination polymer, [Ag(C10H6NO2)]n, the AgI cation is coordinated by two O atoms and one N atom from three 6-quinoline­carboxyl­ate anions in a distorted T-shaped AgNO2 geometry, in which the O—Ag—O angle is 160.44 (9)°. The 6-quinoline­carboxyl­ate anion bridges three Ag+ cations, forming a nearly planar polymeric sheet parallel to (101). The distance between Ag+ cations bridged by the carboxyl group is 2.9200 (5) Å. In the crystal, π–π stacking is observed between parallel quinoline ring systems, the centroid–centroid distance being 3.7735 (16) Å

catena-Poly[[bis­(nitrato-κO)copper(II)]-μ-1,4-bis­(4,5-dihydro-1,3-oxazol-2-yl)­benzene-κ2 N:N′]

In the title coordination polymer, [Cu(NO3)2(C12H12N2O2)]n, the CuII ion, situated on an inversion center, is coordinated by two O atoms from two nitrate anions and two N atoms from two 1,4-bis­(4,5-dihydro-1,3-oxazol-2-yl)benzene (L) ligands in a distorted square-planar geometry. Each L ligand also lies across an inversion center and bridges two CuII ions, forming a polymeric chain running along the [101] direction. The three O atoms of the nitrate group are disordered over two positions in a 3:2 ratio

catena-Poly[[silver(I)-μ-1,2-bis­(4,4-dimethyl-4,5-dihydro-1,3-oxazol-2-yl)ethane-κ2 N:N′] perchlorate hemihydrate]

In the title coordination polymer, {[Ag(C12H20N2O2)]ClO4·0.5H2O}n, the AgI cation is coordinated by two N atoms from two 1,2-bis­(4,4-dimethyl-4,5-dihydro-1,3-oxazol-2-yl)ethane (L) ligands in a nearly linear geometry [N—Ag—N = 171.07 (8)°]. The L ligand bridges adjacent Ag+ cations, forming a polymeric chain running along the c axis. The lattice water mol­ecule is situated on a twofold rotation axis, and links to the perchlorate anion via an O—H⋯O hydrogen bond. The long Ag⋯O separation of 3.200 (4) Å indicates a weak inter­action between the perchlorate anion and the AgI cation. Weak C—H⋯O hydrogen bonding occurs between the chain and the lattice water mol­ecule and between the chain and perchlorate anions. Both five-membered rings of the L ligand display envelope conformations; in one five-membered ring, the flap C atom is disordered on opposite sides of the ring with occupancies of 0.65 and 0.35

Thioxopyrimidine in Heterocyclic Synthesis I: Synthesis of Some Novel 6-(Heteroatom-substituted)-(thio)pyrimidine Derivatives

A series of novel N-cycloalkanes, morpholine, piperazines, pyrazole, pyrimidine, benzimidazolo[1,2-a]pyrimidine, 1,2,3,4-tetrazolo[1,5-a]pyrimidine, azopyrazolo[1,5- a]pyrimidine, pyrimido[4', 5':3,4]pyrazolo[1,5-a]pyrimidines and pyridine derivatives incorporating a 5-cyano-4-methyl-2-phenyl-(thio)pyrimidine moiety were obtained by the intramolecular cyclization of 6-methylthio-pyrimidine, 6-(benzoylmethyl)thio- pyrimidine and 2-[(5-cyano-4-methyl-2-phenylpyrimidin-6-yl)thio]-3-dimethyl- amino-1-phenyl-prop-2-en-1-one with appropriate amines and enaminone compounds, respectively. The structure of all new synthesized compounds was established from their spectral data, elemental analysis and the X-ray crystal analysis

catena-Poly[(μ-2-amino-1,3,4-thiadiazole-κ2N3:N4)di-μ-chlorido-cadmium]

In the title coordination polymer, [CdCl2(C2H3N3S)]n, the CdII cation is coordinated by four Cl− anions and two N atoms from two trans 2-amino-1,3,4-thiadiazole (L) ligands in a distorted octahedral geometry. The L ligand and Cl− anions bridge adjacent Cd cations, forming a polymeric chain along the b axis; the separation between adjacent Cd cations is 3.619 (1) Å. In the crystal, the polymeric chains are interlinking through N—H...Cl hydrogen bonds between the L ligands and Cl− anions

Poly[[μ-(3-aminopyridine)-κ2N:N′-μ-chlorido-chlorido(N,N′-dimethylformamide-κO)nickel(II)] N,N′-dimethylformamide monosolvate]

The title compound, {[NiCl2(C5H6N2)(C3H7NO)]·C3H7NO}n, is a two-dimensional polymer in which the NiII atom is coordinated by two N atoms from two 3-aminopyridine ligands, one O atom from a dimethylformamide (DMF) group, one terminal Cl and two bridging Cl atoms in a distorted octahedral geometry. The NiII atoms are bridged by the 3-aminopyridine ligands [Ni...N = 6.7048 (3) Å] and Cl− atoms [Ni...N = 3.5698 (3) Å], forming (4,4) two-dimensional nets. The DMF solvent molecule and the non-bridged Cl− ions participate in N—H...O and N—H...Cl hydrogen bonds with the amino groups