![Loading...](https://link.springer.com/static/c4a417b97a76cc2980e3c25e2271af3129e08bbe/images/pdf-preview/spacer.gif)
-
Article
Electrochemical interconversion of 1-(p-tolyl)-6-methyl-2,4-diphenylpyrimidinium perchlorate and 1-(p-tolyl)-6-methylene-2,4-diphenylpyrimidine
It is shown that reduction of the 6-methyl-1-(p-tolyl)-2,4-diphenylpyrimidinium cation proceeds in two one-electron stages. In the first stage, an unstable radical is formed, and in the second stage, an unstab...
-
Article
Synthesis of the alkaloid dioxyline and other 6,7-dimethoxyisoquinolines in a modified ritter reaction
It has been found that aceto- and benzonitriles and 3,4-dimethoxyphenylacetone in the presence of acetylperchlorate or upon heating in polyphosphoric acid or polyphosphoric ester form the corresponding isoquin...
-
Article
Condensation of 6-methyl-3-azapyrylium salts to pyrido[1,2-c]pyrimidinium derivatives
Under the influence of DMF/Ac2O 2,4-diphenyl-6-methyl-3-azapyrylium perchlorates undergo condensation to give pyrido[1,2-c]pyrimidinium perchlorates. The structure of one of the perchlorates was proved by x-ray d...
-
Article
Synthesis of 4H-1,3-oxazinium salts from an N-ethylnitrilium salt and carbonyl compounds
-
Article
Acid-catalyzed acylation of 4-alkyl-3-azapyrylium salts and the synthesis of 4-acylaminopyrylium salts
4-Alkyl-3-azapyrylium salts undergo acylation at the alkyl group under acid-catalyzed conditions to give 4-acylmethyl-3-azapyrylium derivatives, which upon heating in proton-donating solvents recyclize to give...
-
Article
Unusual recyclization of 5-methyl-2, 4-diphenyl-6-(2-N, N-dimethylaminovinyl)-3-azapyrilium perchlorate
-
Article
Formation of cyanines from pyrylium salts and aliphatic acid anhydrides
-
Article
Dual reacting of monocyclic α-carboxypyrylium salts in reaction with secondary amines
-
Article
Synthesis of flavones with hypolipidemic activity
-
Article
Photocyclization of 1,2-diaryl- and photobicyclization of 1,2,6-triarylpyridinium cations
New 1,2-diaryl- and 1,2,6-triarylpyridinium salts, containing various five- and six-membered heteroaromatic substituents in the 1, 2, and 6-positions of the pyridinium ring, were synthesized. New tetra- and he...
-
Article
Reactions of heterocyclic cations with nitrogen-containing nucleophiles. 11. Reaction of 2,6-diphenylpyrylium perchlorate with primary amines, hydrazine, and hydroxylamine
The reaction of 2,6-diphenylpyrylium perchlorate with methylamine and various anilines in acetic acid leads to pyridinium salts; 3,4-bispyridinium perchlorates were obtained in dimethylformamide. The reaction ...
-
Article
Synthesis of γ-pyrones, flavones, and isocoumarins by destructive oxidation of pyranylidenes and their benzo analogs
Preparative methods for the synthesis of isocoumarins, γ-pyrones, and flavones by destructive oxidation of methylenepyrans with potassium permanganate in acetone were developed.
-
Article
Β-Chloro-Β-ferrocenylacrylaldehyde and its application in the synthesis of pyrylium and pyridine derivatives of ferrocene
Β-Chloro-Β-ferrocenylacrylaldehyde, to which an s-cis configuration was assigned on the basis of the PMR spectral data, was synthesized from acetylferrocene by the Vilsmeier-Haack reaction. 2, 3, 6-Trisubstitu...
-
Article
Synthesis of pyrylium salts by condensation of Β-chlorocinnamaldehydes with carbonyl compounds
A method is proposed for the synthesis of unsymmetrical unsubstituted pyrylium salts by condensation of Β-chlorocinnamaldehydes with methyl and methylene ketones and Β-dicarbonyl compounds in the presence of HClO
-
Article
Synthesis of isoflavones that have hypocholesterinemic activity
-
Article
Synthesis of substituted γ-pyrones
Substituted γ-pyrones were synthesized by the acylation of phenylacetaldehyde and its enol acetate with acetic and propionic anhydrides in the presence of 70% HClO4. The mechanism of the reaction is examined, and...