2567-32-0Relevant articles and documents
N -aminopyridinium salts as precursors for N-centered radicals - Direct amidation of arenes and heteroarenes
Greulich, Tobias W.,Daniliuc, Constantin G.,Studer, Armido
supporting information, p. 254 - 257 (2015/03/05)
Readily prepared N-aminopyridinium salts are valuable precursors for the generation of N-centered radicals. Reduction of these salts by single electron transfer allows for clean generation of amidyl radicals. It is shown that direct radical C-H amination of heteroarenes and arenes can be achieved with N-aminopyridinium salts under mild conditions by using photoredox catalysis.
CHEMISTRY OF ENOL ETHERS. LXXIII. SYNTHESIS OF PYRYLIUM SALTS FROM THE MONOACETALS OF 1,5-DICARBONYL COMPOUNDS.
Makin, S. M.,Markina, T. A.,Boiko, I. I.
, p. 258 - 260 (2007/10/02)
The reaction of unsubstituted and methyl-substituted 5,5-dialkoxy-2-pentenals and 4,6,6-trialkoxy-2-hexanones with strong mineral acids (perchloric, hexachlorostannic) leads to the formation of pyrylium salts.Pyrylium, 2-methylpyrylium, 4-methylpyrylium, and 2,5-dimethylpyrylium perchlorates and hexachlorostannates were obtained by this method.Pyrylium salts containing a methyl group at position 2 or 4 react with p-dimethylaminobenzaldehyde to form the corresponding styryl dyes.
