Near-infrared study of the interaction of pyridine with acid-treated montmorillonite
16
Citation
56
Reference
10
Related Paper
Citation Trend
Keywords:
Silanol
Nitrogen atom
Cite
Citations (9)
The structures of two novel pyridinium catecholates are reported by reaction of pyridine with tetrachloro-o -benzoquinone and tetrabromocatechol; with tetrachlorocatechol pyridine acts as a base with the structure of the pyridinium-catecholate salt reported.
Base (topology)
Cite
Citations (4)
1-(N-Monosubstituted amido) pyridinium compounds derived from novel quaternary salts of pyridine, N-aminopyridinium compounds, were quite reactive to nucleophilic agents at 2- and 4-positions of their pyridine rings, especially at 4-position. The 1-(N-monosubstituted amido) pyridinium salts were reacted with cyanide ion to give N-monosubstituted amides and cyanopyridines, (predominantly 4-cyanopyridine), both in good yields. The reaction may involve dihydro-type intermediates and one intermediate 1-(N-methylacetamino)-4-cyano-1, 4-dihydropyridine could be obtained stably. By utilizing this reaction, it would be possible to introduce a cyano group at 4-position of various pyridine derivatives and to obtain various primary amines.
Primary (astronomy)
Nucleophilic Addition
Cyanide ion
Cite
Citations (9)
Cite
Citations (20)
Abstract The gas‐phase basicities (GBs) of 12 nicotinoids were calculated for the two potential sites of protonation, the sp 2 pyridine and the sp 3 amino nitrogen atoms, at the B3LYP/6–311 + G(3df,2p)//B3LYP/6–31G(d,p) level and estimated from substituent effects on the GBs of 2‐substituted pyrrolidines and N ‐methylpyrrolidines. It was found that, in contrast to the Nsp 3 protonation in water, nicotinoids with a secondary amino nitrogen (substituted nornicotines, anabasine, anatabine) are protonated on the pyridine nitrogen. Nicotinoids with a tertiary amino nitrogen (substituted nicotines, N ‐methylanabasine, N ‐methylanatabine) are protonated on either the pyridine or the amino nitrogen, depending on the electronic effects of the substituents and the strength of an intramolecular CH···Nsp 3 hydrogen bond. Copyright © 2005 John Wiley & Sons, Ltd.
Cite
Citations (17)
Tetracyanoethylene
Pyridine-N-oxide
Cite
Citations (1)
The molecular second hyperpolarizabilities γ of cationic 3- or 4-substituted pyridine derivatives have been investigated. The γ values are calculated by an ab initio molecular orbital (MO) method at correlated levels including CCSD(T). The magnitude of γ for the pyridinium cation is shown to be smaller than that of pyridine. It is found that γ for the pyridinium cation changes dramatically with substitution, whereas γ for neutral pyridine does not show such large substituent effects. This remarkable substituent effect on γ of cationic pyridine derivatives is one of the special features of cationic species.
Cationic polymerization
Hyperpolarizability
Cite
Citations (8)
In the last few years, imidazo[1,5-a]pyridine scaffolds and derivatives have attracted growing attention due to their unique chemical structure and optical behaviors. In this work, a series of pyridylimidazo[1,5-a]pyridine derivatives and their corresponding pyridinium salts were synthesized and their optical properties investigated to evaluate the effect of the quaternization on the optical features both in solution and polymeric matrix. A critical analysis based on the spectroscopic data, chemical structures along with density functional theory calculation is reported to address the best strategies to prevent aggregation and optimize the photophysical properties. The obtained results describe the relationship between chemical structure and optical behaviors, highlighting the role of pendant pyridine. Finally, the presence of a positive charge is fundamental to avoid any possible aggregation process in polymeric films.
Characterization
Chemical structure
Cite
Citations (10)
The title complex, (C5H6N)2[MoCl5(C5H5N)], belongs to a group of halo(pyridine)molybdenum(III) octahedral complexes. The pyridinium cations and pentachloro(pyridine-N)molybdate(III) anions are held together by N–H ⋯ Cl hydrogen bonds which affect the distances within the [MoCl5(py)]2− anion. The anion displays a previously unobserved orientation of the coordinated pyridine, which lies in almost the same plane as two trans-positioned equatorial chlorines.
Cite
Citations (0)
Abstract When 2-chloro-3-(substitued phenoxy)naphthazarine (1) was treated with pyridine or substituted pyridine at elevated temperature, an unexpected reaction took place. The product was identified as 5,8-Dihydroxy-1,4-dioxo-3-(substituted pyridinium)-2-naphthoxide (3, 4). A reaction mechanism for the formation of this product was postulated.
Pyridinium Compounds
Cite
Citations (3)