The existence of a peroxygen acid of sulfur was recognized nearly one and half centuries
ago, 1, 2 but it was not until 1898 that Caro 3 demonstrated the existence of two such acids …

Hantzsch reaction seems to be one of the earliest procedures for the production of pyridines.
Later on, Hantzsch 1, 4-dihydropyridines, which mimic NADH reduction process in vitro …

Catalytic aromatization of Hantzsch 1,4-dihydropyridines by ferric perchlorate in acetic acid -
ScienceDirect Skip to main contentSkip to article Elsevier logo Journals & Books Search …

Abstract A series of 1, 4-dihydropyridines were synthesized in an environmentally benign
method, by reacting aldehydes with acetoacetate esters or acetylacetone and ammonium …

Manganese Triacetate Mediated Oxidation of Hantzsch 1,4-Dihydropyridines to Pyridines Page
1 Pergamon Tetrahedron Letters 40 (1999) 21-24 TETRAHEDRON LETTERS Manganese …

4-Substituted Hantzsch 1, 4-dihydropyridines and 1, 3, 5-trisubstituted pyrazolines were
oxidized to the corresponding pyridines and pyrazoles, respectively, in high yields by …

A mild, highly efficient and metal-free synthetic method for aromatization of 1, 4-
dihydropyridines employing urea–hydrogen peroxide adduct as oxidant catalyzed by …

Aromatization of Hantzsch 1,4-dihydropyridines and 1,3,5-trisubstituted pyrazolines with HIO3
and I2O5 in water - ScienceDirect Skip to main contentSkip to article Elsevier logo Journals & …

Bi (NO3) 3 5 H2O (1), an inexpensive crystalline solid readily oxidises several 4-substituted
Hantzsch 1, 4-dihydropyridines in acetic acid medium at room temperature. The reaction …

Aryl-and 4-alkyl-1, 4-dihydropyridines, prepared by microwave-assisted Hantzsch reaction,
are readily and efficiently aromatized in only one minute using commercial manganese …