25506-69-8Relevant academic research and scientific papers
Triarylpyridinium salts: Synthesis and electrochemical properties
Dolganov, Alexandr V.,Tanaseichuk, Boris S.,Pryanichnikova, Margarita K.,Ivleva, Alina Y.,Chernyaeva, Oksana Y.,Grigoryan, Karina A.,Chugunova, Ekaterina A.,Yurova, Veronika Y.
, (2019)
The electrochemical properties of the triarylpyridinium salts were studied. The effect of functional substituents on redox properties has been investigated in detail. Electrochemical reduction of salts to the anion in acetonitrile is the result of two one
Scanning tunneling microscopy-induced reversible phase transformation in the two-dimensional crystal of a positively charged discotic polycyclic aromatic hydrocarbon
Mali, Kunal S.,Wu, Dongqing,Feng, Xinliang,Muellen, Klaus,Van Der Auweraer, Mark,De Feyter, Steven
supporting information; experimental part, p. 5686 - 5688 (2011/06/18)
We report on the observation and manipulation of a two-dimensional crystal formed by a positively charged discotic polycyclic aromatic hydrocarbon at the liquid-solid interface. Using scanning tunneling microscopy (STM) as a tool, the supramolecular scaff
REACTION OF ORGANOLITHIUM COMPOUNDS WITH 1-SUBSTITUTED 2,4,6-TRIPHENYLPYRIDINIUM PERCHLORATES
Schwarz, Marian,Kuthan, Josef
, p. 1880 - 1887 (2007/10/02)
The reaction of organolithium compounds with 1-substituted 2,4,6-triphenylpyridinium perchlorates Ia-Ic produces mixtures of 1,4-dihydropyridines IIa-IIe and 1,2-dihydropyridines IIIa-IIIe.Analogous reactions of phenylmagnesium bromide with compounds Ia-Ic proceed with very low conversions (less than 1percent).Photochromism in visible range is observed only with the compounds II which have two aromatic substituents at 4-position, whereas compounds III and IId show no visible photochromism.The molecular spectra of the compounds newly prepared are discussed.
Kinetics and Mechanism of the Pyrylium to Pyridinium Cation Transformation in Dichloromethane
Katritzky, Alan R.,Leahy, David E.
, p. 171 - 174 (2007/10/02)
Kinetic rates for cyclisation of divinylogous amides (derived from pyrylium cations and primary amines) into pyridinium cations are measured for CH2Cl2 solutions and compared with previous results in water and other solvents.The ring-closure is catalysed
Triphenylpyridinium Derivatives of α-Amino-acids and a Dipeptide
Katritzky, Alan R.,Grzeskowiak, Nicholas E.,Eweiss, Namek F.,Elsherbini, Esayed A.
, p. 497 - 500 (2007/10/02)
Primary amines react with the triphenylpyrylium cation in high polarity R3N-R'CO2H mixtures and phenolic solvents, forming the usual pyridinium salts.Such reaction of α-amino-acids is accompanied by spontaneous decarboxylation, yielding alkyl substituted
Kinetics and Mechanism of the Reactions of Primary Amines with Pyrylium Cations
Katritzky, Alan R.,Manzo, Ruben H.
, p. 571 - 575 (2007/10/02)
The initial reaction of primary amines with pyrylium cations to give the ring-opened intermediate is fast for strongly basic amines and is base-catalysed for weak amines.Ring-closure of the intermediate to give the pyridinium derivative is subject to ster
SYNTHESIS OF PYRIMIDINE DERIVATIVES BY REACTION OF PYRYLIUM SALTS WITH GUANIDINE AND COMPOUNDS OF THE GUANIDINE SERIES
Zvezdina, E. A.,Zhdanova, M. P.,Dorofeenko, G. N.
, p. 574 - 578 (2007/10/02)
2,4,6-Triphenylpyrylium perchlorate reacts with methylguanidine to give 1-methyl-2-amino-4,6-diphenylpyrimidinium perchlorate, which undergoes the Dimroth rearrangement to give 2-methylamino-4,6-diphenylpyrimidine. 2,4,6-Triarylpyrylium perchlorates react
The Photocyclisation of 1,2-Diarylpyridinium Cations and the Photobiscyclisation of 1,2,6-Triarylpyridinium Cations
Katritzky, Alan R.,Zakaria, Zuriati,Lunt, Edward
, p. 1879 - 1887 (2007/10/02)
Photocyclisation of 1-(2-pyridyl)-2-arylpyridiniums yields benzopyrido-1,8-naphthyridinylinium cations.Photobiscyclisation of 1,2,6-triarylpyridiniums gives benzoquinolizinophenanthridinylium cations and their 9-aza-derivatives
Proton Nuclear Magnetic Resonance Study of the Addition of Methoxide Ion to 2,4,6-Triphenylpyrylium, 2,4,6-Triphenylthiopyrylium, 1,2,4,6-Tetraphenylpyridinium, and 1-(p-Nitrophenyl)-2,4,6-triphenylpyridinium Cations
Aveta, Raffaele,Doddi, Giancarlo,Insam, Normanno,Stegel, Franco
, p. 5160 - 5163 (2007/10/02)
The reactions of 2,4,6-triphenylpyrylium (1a) and 2,4,6-triphenylthiopyrylium (1b) with methoxide ion are shifted toward the formation of adducts, as shown by 1H NMR.The former yields practically only a 2H-pyran adduct in MeCN, Me2SO, or MeOH.In MeOH, 1b yields an adduct with a 2H-thiopyran structure, whereas in MeCN this adduct is obtained together with the isomeric 4H-thiopyran adduct.In Me2SO or MeCN, the 1,2,4,6-tetraphenylpyridinium cation yields a 1,2-dihydropyridine.In contrast, in MeOH this equilibrium is shifted toward the reagents.The lower degree of delocalization of the positive charge in the pyridinium cation seems to be the main cause of its lower tendency to undergo nucleophilic addition.
