Ionic reaction products of iodine with pyridine, 4–methylpyridine, and 4-tert-butylpyridine in a polyethylene matrix. A FTIR polarization spectroscopic investigation (original) (raw)
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Investigations on pyridinium salts as a solid-state ionics
Journal of Applied Polymer Science, 2009
The object of this work is to prepare polymer poly(2vinylpyridine), P-2VP, and its salts like P-2VP-HI, P-2VP-HIO3, and P-2VP-HIO4. The formation of P-2VP salts was confirmed by IR and 1H NMR techniques. Conductivities of these were determined in solid state at various temperatures from 30 to 90°C. Observations indicated that the addition of I− or IO3− or IO4− ions affect the ionic conductivity of P-2VP. Molecular mass determination and analytical results indicated that 94, 92.5, and 95% of the pyridine molecules in the P-2VP chain were hydroiodated, iodated, and periodated, respectively, with the corresponding acids of iodine. The total ionic transport number and activation energy of the polymers were also determined. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009
Alkylation of the 2-hydroxypyridine anion in ionic liquid media
Chemistry of Heterocyclic Compounds, 2008
The alkylation reaction of the ambident 2-hydroxypyridine anion was examined in ionic liquid media. Ionic liquids increase the alkylation reaction rate in comparison with molecular liquids, as well as the level of impact on the reaction rates of the counter ion and/or additives, and the distribution of isomers of the reaction products in trans-formations of the ambident 2-hydroxypyridine anion.
Basicity of Pyridine and Some Substituted Pyridines in Ionic Liquids
Journal of Organic Chemistry, 2010
The equilibrium constants for ion pair formation of some pyridines have been evaluated by spectrophotometric titration with trifluoroacetic acid in different ionic liquids. The basicity order is the same in ionic liquids and in water. The substituent effect on the equilibrium constant has been discussed in terms of the Hammett equation. Pyridine basicity appears to be less sensitive to the substituent effect in ionic liquids than in water.
Analytical reactions of substituted pyrimidines
Talanta, 1982
Qmry-Analytical aspacts of the chemistry of substituted pyrimidincs are reviewed. Pyrimidine can be considered as derived from pyr idine. It is a weaker base @K, 1.3) than the related compounds pyridazine, pyridine and imidazole. Considering the distribution of n-electron densities and the resonance hybrids representing the pyrimidine and pyridine molecules, it is inferred that the C5 position of pyrimidine should correspond to C, in pyridine and be the most susceptible to electrophilic attack. Similarly, positions 2, 4 and 6 in pyrimidine should correspond to 2 and 4 in pyridine. Substituents at these. positions should have comparable reactivities. l Pyrimidine Pyridazine Pyridine Imidazole (pK, 1.3) (pK, 2.33) (PK, 5.23) (pK, 7.2) Pyrimidine derivatives and compounds in which the pyrimidine ring is a part of a more complex system were amongst the first compounds to be synthesized. They are vital compounds, widely distributed in living organisms. The chemistry2-a and the biochemical 9 aspects-'* of the pyrimidincs have been extensively reviewed Recently, the stereochemistry of metal-pyrimidine complexes has also been reviewed. * 5 The compounds have long been extensively used for analytical work, and these aspects are reviewed in this article, together with methods for analysis of the compounds themselves.
HETEROCYCLES, 2002
Reaction of trichloropyrimidine (5) with 4-(dimethylamino)pyridine or 4-(pyrrolidin-1-yl)pyridine in ethyl acetate in the presence of sodium tetraphenylborate yielded the tricationic pyrimidines (7) and (8). Applying the same reaction conditions to tetrachloropyrimidine (6) resulted in the formation of highly reactive 5-chloro substituted trications (9) and (10), which could be intercepted by anhydrous alcohols to give the dicationic species (11) and (12). Characterizations by means of ESIMS and FABMS, a semiempirical calculation and an X-Ray analysis were performed.
ChemInform, 2015
Chalcone on reaction with malononitrile in ionic liquid affords 2-amino-3-cyano-4,6-disubstituted pyridines in excellent yield. The pyridine derivatives are used as precursor for the synthesis of 5,7-disubstituted pyrido[2,3-d] pyrimidine-4(3H)-one 4a-d and 5,7-disubstituted pyrido[2,3-d]pyrimidine-2,4 (1H,3H)-dithione 5a-d derivatives. The heterocyclic bases, namely 2,4-disubstituted-5-thioxo-7,8-dihydro-pyrido[2',3':4,5]pyrimido[2,1-b][1,3]thiazin-9-ones 6a-d, 2,4-disubstitued-5-thioxo-pyrido[2',3':4,5]pyrimido[2,1-b][1,3] thiazol-8-ones 7a-d, 8-(4-chlorobenzylidene)-2,4-disubstitued-5-thioxo-7,8-dihydro-pyrido[2',3':4,5]pyrimido[2,1-b][1,3]thiazin-9-ones 8a,b and 7-(4-chlorobenzylidene)-2,4-disubstitued-5-thioxo-pyrido[2',3':4,5]pyrimido[2,1-b] [1,3]thiazol-8-ones 9a,b derivatives have been thus synthesized. The structure of all the synthesized compounds have been established by elemental analysis, IR, 1 H and 13 C NMR spectral data.
XPS studies of iodine complexes of pyrrole ? N-methylpyrrole copolymer
Polymer Bulletin, 1989
Simultaneous chemical copolymerization and oxidation of pyrrole and N-methylpyrrole by iodine has been carried out. The electrical conductivity, the I~ content and the amount of positively charged pyrrolylium nitrogen ~decrease with increasing N-methylpyrrole content in the copolymer complexes.
Investigation of the electronic absorption spectra of some pyridine derivatives iodine complexes
Proceedings of the Indian Academy of Sciences - Section A, 1976
The electronic absorption spectra of some pyridine derivativesiodine complexes are measured and discussed. The thermodynamic constants of these complexes are calculated. It is confirmed that the stability of the complex depends on the type as well as the position of the substituent on pyridine nucleus. A linear relationship is obtained between the enthalpies-AH and the shift of the blue iodine band A "v of the complexes. It is also found that as the Pi electron density on the nitrogen atom increases, the stability of the complex also increases.
The electronic absorption spectra of different pyrimidine derivatives have been measured experimentally and calculated theoretically by the PPP and CNDO/S methods. These pyrimidine derivatives are: 4,6-dichloro-pyrimidine (I), 4,6-dichloro, 5-amino-pyrimidine (II), 2,4,6-trichloro-pyrimidine (III), 4,6-dihxdroxy-pyrimidine (IV), 4,6-dihxdroxy-5-nitro-pyrimidine (V), 2,4-diamino-pyrimidine (VI), 2,4-diamino-6-hydroxy-pyrimidine (VII), 2,4-dihydroxy-5-carboxy-pyrimidine (VIII), 2,4-dimethyl-6-hydroxy-pyrimidine (IX), 5-nitro-uracil (X), and orotic acid (XI). The observed electronic spectral shifts are quantitatively analyzed in relation to different solute-solvent interaction mechanisms. The effects of solvent polarity and hydrogen bonding on the spectra are discussed in the light of theoretical predictions. This comparative analysis provides a reasonable picture of the solvent effects on the absorption spectral properties of pyrimidine nucleobases.