Three structural isomers of pyridinecarboxaldehydes (2-, 3- and 4-pyridinecarboxaldehyde) have been investigated in detail with matrix-isolation infrared spectroscopy in the 3000–600 cm−1 region, combined with the UV photo-excitation and density-functional theory (DFT) calculations. Two rotamer...
The Schiff bases formed by condensation of S-methyl- and S-benzyldithiocarbazate with 2-pyridinecarboxaldehyde react with zinc(II) and cadmium(II) acetates to form stable metal complexes of general formulas, [Zn(NNS)(CH3COO)]2 and [M(NNS)2] (M = Zn2+, Cd2+; NNS− = anionic forms of the 2-pyridine...
The (E)-4-nitro-N′-(pyridine-2-ylmethylene)benzohydrazide, a derivative from 2-pyridinecarboxaldehyde, displays E/Z isomerization induced by ultraviolet radiation in which the process of photoisomerization was evidenced and followed by 1D 1H NMR. The structure of the compound was determined by ...
Polyacrylamide hydrogels have been used extensively to study cell responses to the mechanical and biochemical properties of extracellular matrix substrates. A key step in fabricating these substrates is the conjugation of cell adhesion proteins to the polyacrylamide surfaces, which typically inv...
Two types of 2-pyridinecarboxaldehyde thiosemicarbazones Ga(III) complexes, which are 2:1 and 1:1 ligand/Ga(III) complexes, were synthesized and determined by X-ray single crystal diffraction. The antiproliferative activity of these Ga(III) complexes have been examined to illuminate the structur...
A cubane-like tetranuclear nickel(II) compound [Ni4(L)4Cl4(H2O)3(C2H5OH)]·H2O (1) and a binuclear iron(III) compound Fe2(L)2Cl4 (2) (HL = 2-pyridinemethanol) have been prepared by solvothermal reaction of metal chloride and 2-pyridinecarboxaldehyde in C2H5OH, in which 2-pyridinecarboxaldehyde w...
FT-Infrared (4000–400 cm−1) and NIR-FT-Raman (4000–50 cm−1) spectral measurements have been made for 2-chloro- and 2-bromo-3-pyridinecarboxaldehydes. A DFT vibration analysis at B3LYP/6-311++G (d,p) level, valence force-fields and vibrational mode calculations have been performed. Aided by ver...
The Schiff base, 2-[(pyridin-2-ylmethylidene)amino]-6-aminopyridine (L) was synthesized by 1:1 condensation of 2-pyridinecarboxaldehyde and 2,6-diaminopyridine. The ligand and its complexes were characterized by different physicochemical studies. The analytical and spectroscopic tools indicated ...
The influence of poly(4-vinylpyridine-poly(3-oxide-ethylene) tosyle) P4VPPEO5000Ts, on the corrosion inhibition of iron in molar sulphuric acid solution is studied using weight-loss, polarisation resistance, potentiodynamic and EIS measurements. P4VPPEO5000Ts is an excellent inhibitor and its in...
New chiral 2-(4-substituted-piperidino)-3-vinylpyridines undergo stereoselective isomerization to pyrido [1,2-a][1,8]naphthyridines. The stereoselectivity of this reaction was found dependent on the experimental conditions (temperature and solvent polarity) and the stereoelectronic features of t...
Solvents can strongly influence the equilibrium between dormant and active species which is involved in 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO)-mediated radical polymerizations. At 110°C, the overall polymerization rate of 3-vinylpyridine in pyridine was logically found lower than that in ...
Photochemical and photophysical properties of a polymer, Re-P4VP, consisting of Re(I)(CO)3(phen) pendants grafted to a poly-4-vinylpyridine backbone, P4VP, were interpreted on the bases of morphological transformations. These transformations are responsible of a significant increase of the MLCTR...
Publisher SummaryIn the vapor phase aliphatic aldehyde and ketone oximes exhibit vC=N in the range 1650–1665 cm-1, and in the liquid and solid phase in the range 1649–1670 cm-1. In the vapor phase vOH occurs in the range 3642–3654, and in CCl4 solution in the range 3580–3600cm-1. In CCl4 sol...
O-Alkylation of (E)- and (Z)-oxime was achieved via single electron oxidation of N-vinyl lactams by using a catalytic amount of tris(aryl)aminium salts as initiator, producing the corresponding oxime ethers in high yields under mild condition. A reaction mechanism based on electron transfer was ...
Ru(DMSO)4Cl2 is catalytically active for converting aldehydes to primary amides via oxime intermediates. This catalyst is readily available, and requires no additional ligands, a great simplification compared to previous work. A Ru(II)/(IV) mechanism is proposed.
Radical cation promoted O-alkylation of oxime with N-vinyllactam was achieved under base free condition by using catalytic tris(4-bromophenyl)aminium cation radical (TBPA+SbCl6-) as an initiator to produce the corresponding oxime ether in high yields.
A series of novel unsaturated oximes were conveniently prepared from the corresponding vinylnitro compounds by reduction with SnCl2·2H2O. The structures of the oximes were characterized by 1H and 13C NMR, IR and HRMS, and X-ray crystallography analysis of 1-(6-chloro-pyridin-3-ylmethyl)-4,5-dih...
O-Alkylation of oximes with N-vinylpyrrolidin-2-one or N-methyl-N-vinylacetamide was efficiently initiated by a catalytic amount of cerium (IV) ammonium nitrate (CAN), giving the corresponding oxime ether derivatives in good yield.
5-Nitro-2-furaldoxime, 5-nitro-2-furaldehyde hydrazone, and several derivatives have been prepared, and their stereochemistry studied by NMR. The relationship between the structures of the compounds and their in vitro and in vivo antimicrobial activity was investigated.
The FTIR and FT-Raman spectra of 5-nitro-2-furaldehyde oxime (NFAO) have been recorded in the regions 4000–400 cm−1 and 3500–50 cm−1, respectively. The total energies of different conformations have been obtained from DFT (B3LYP) with 6-311++G(d,p) basis set calculations. The computational res...
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