A Schiff base dicarboxylic acid (1) was prepared by condensation of 2-hydroxy-1naphthaldehyde with 5-aminoisophthalic acid. Its solvates with pyridine (2a and 2b) and dimethylformamide (3) were prepared by liquid-assisted grinding and by conventional solvent-based methods. All products were characterised by FT-IR spectroscopy, thermogravimetric analysis and differential scanning calorimetry. Th...

A novel pyrazolo-enaminones, bipyrazoles and bipyrazolopyridines from 1-(5-hydroxy-3-methyl-1-phenyl-1H-pyrazol-4-yl)butane-1,3-dione 4-methyl-2-phenyl-2H-pyrazolo[3,4-b]pyridine-3,6(3aH,7H)-dione have been synthesized by assisted heating with microwave radiation without any catalyst. The pyridine pyrazole ring formation has developed easily accessible enamino keto esters formylation followed i...

A tetranuclear dysprosium Schiff base complex was isolated by reacting chloride with 2-hydroxy-3-methoxybenzaldehyde and 2-(aminomethyl)pyridine in-situ under basic conditions. The Dy(III) characterized elemental analyses, single crystal X-ray diffraction molecular spectroscopy. crystallizes in the triclinic space group P-1 unit cell parameters of a = 10.2003 (4), b 13.8602 (5), c 14.9542 (6), ...

The first synthesis of 1-deaza-pyridoxal 5'-phosphate (2-formyl-3-hydroxy-4-methylbenzyl phosphate) is described. The chemoenzymatic approach described here is a reliable route to this important isosteric pyridoxal phosphate analogue. This work enables elucidation of the role of the pyridine nitrogen in pyridoxal 5'-phosphate dependent enzymes.

The reaction of nickel(II) nitrate hexa-hydrate, guanidine (G) and 4-hydroxy-pyridine-2,6-dicarboxylic acid (hypydcH(2)) in a 1:2:2 molar ratio in aqueous solution resulted in the formation of the title compound, (CH(6)N(3))(2)[Ni(C(7)H(3)NO(5))(2)]·2H(2)O or (GH)(2)[Ni(hypydc)(2)]·2H(2)O. The six donor atoms of the two 4-hydroxy-pyridine-2,6-dicarboxyl-ate or (hypydc)(2-) ligands form a distor...

2-Hydroxy-pyridine when treated with concentrated sulfuric acid is sulfonated at the 3-position to yield the title hydrated salt, H(3)O(+)·C(5)H(4)NO(3)S(-)·2H(2)O. In the crystal structure, the cations, anions and uncoordinated water mol-ecules are linked by extensive O-H⋯O and N-H⋯O hydrogen bonds into a three-dimensional network. The crystal studied is a non-merohedral twin with a twin compo...

In this report, using the ab initio method of stability and electron-orbital properties of the complex (2,66-diaminopyridinium bis (4-hydroxy-pyridine-2, 6-dicarboxylate) dihydrate chromate III) with a change of ligand at position 17 It has been studied with ligands such as F, Cl, Br,,, and. The results indicate changes in energy levels, bipolar moments, and sustainability rates due to these ch...

The structure of the mixed, enzyme-cofactor disulfide intermediate of ketopropyl-coenzyme M oxidoreductase/carboxylase has been determined by X-ray diffraction methods. Ketopropyl-coenzyme M oxidoreductase/carboxylase belongs to a family of pyridine nucleotide-containing flavin-dependent disulfide oxidoreductases, which couple the transfer of hydride derived from the NADPH to the reduction of p...

Sphingomonas melonis TY utilizes nicotine as a sole source of carbon, nitrogen, and energy through a variant of the pyridine and pyrrolidine pathways (VPP). A 31-kb novel nicotine-degrading gene cluster, ndp, in strain TY exhibited a different genetic organization with the vpp cluster in strains Ochrobactrum rhizosphaerae SJY1 and Agrobacterium tumefaciens S33. Genes in vpp were separated by a ...

The title compound, C(12)H(9)N(2) (+)·C(7)H(4)ClO(3) (-)·C(12)H(8)N(2)·C(7)H(5)ClO(3), contains one phenanthrolinium (Hphen) cation, one phenanthroline (phen) mol-ecule, one 4-chloro-2-hydroxy-benzoate anion (hcba) and one 4-chloro-2-hydroxy-benzoic acid (Hhcba) mol-ecule in the asymmetric unit. The phen mol-ecule is approximately parallel to Hphen, making a dihedral angle of 1.98 (6)°. The cen...