Although the chemistry of b-fused oxazolones la [2] and imidazopyridine derivatives Ib [3] is
well reviewed, no data are reported yet about the synthesis of the mesoionic …

The methods for the synthesis of oxazolo [3, 2-a] pyridinium and oxazolo [3, 2-a]
pyrimidinium salts and their reactivities are reviewed. Both systems exhibit ambident …

Aryloxazolo [3, 2‐a] pyridinium perchlorate, 1a, and its 5‐methyl homologue, 1b, undergo
quite different ring transformations when reacting with piperidine. For 1a the opening of the …

Reaction of 3, 5-diamino-1-R-1, 2, 4-triazoles (R= Ph, Bn) with β-keto esters results in the
reversible formation of N-(5-amino-1-R-1, 2, 4-triazol-3-yl)-substituted enaminoesters (8) …

The reaction between aminoguanidine and succinic acid in water under acid catalysis yields
a mixture of guanyl-and digyanylhydrazides of succinic acid, which turns into a poorly …

This review deals with the frequency of occurrence of literature references to various types of
reagents used in syntheses of the pyridine ring and a number of its heterocyclic analogs …

In the article, at the mathematical level of rigor, it is shown that the pair of concepts”
covalence—mesoionicity” correlates in the same way as the pair” kekuleness—non …

Pyrroles from oxazoles | Chemistry of Heterocyclic Compounds Skip to main content
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Chemists are inveterate users of symbols. Elements are denoted by letters, compound
formulae by combinations of letters and numbers, physical constants, wave functions …

Molecular design of tautomeric interconversions of heterocycles Page 1 Russian Chemical
Bulletin, International Edition, Vol. 51, No. 2, pp. 205—221, February, 2002 205 1066 5285/02/5102 …