A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 298-96-4, Name is Tetrazolium Red, molecular formula is C19H15ClN4. In an article, author is Blanco, MM,once mentioned of 298-96-4, Recommanded Product: Tetrazolium Red.
Mechanistic evidence of a Gabriel Colman-type rearrangement
Rearrangement of quinolinimidoacetic acid derivatives induced by alkoxides leading to a mixture of 7-substituted 8-hydroxy-1,6-naphthyridin-5(6H)-ones and 6-substituted 5-hydroxy-1,7-naphthyridin-8(7H)-ones (Gabriel Colman-type reaction) was studied. Several chemical evidences accounts for a mechanism in two steps with quinolinamic ester intermediates (N-substituted 3-carbamoyl-2-pyridinecarboxylic acid alkyl esters and 2-carbamoyl-3-pyridinecarboxylic acid alkyl esters). These compounds were isolated from a reaction in mild conditions and their structure confirmed through an unequivocal synthesis.
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Reference:
1,8-Naphthyridine – Wikipedia,
,1,8-Naphthyridine | C8H6N2 – PubChem