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ChemInform Abstract: Ring-Chain Transformation in the 4-Hydroxy-3,4-dihydro-1,2,4-triazine Series and a Novel Method for the Synthesis of 1,2,4-Triazine-4-oxides.

✍ Scribed by D. N. KOZHEVNIKOV; V. N. KOZHEVNIKOV; V. L. RUSINOV; O. N. CHUPAKHIN; E. O. SIDOROV; N. A. KLYUEV

Publisher: John Wiley and Sons
Year: 2010
Weight: 36 KB
Volume: 29
Category: Article
ISSN: 0931-7597
DOI: 10.1002/chin.199837190

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✦ Synopsis

Ring-Chain Transformation in the 4-Hydroxy-3,4-dihydro-1,2,4triazine Series and a Novel Method for the Synthesis of 1,2,4-Triazine-4-oxides.

-Condensation of the hydrazones (I) with aldehydes or ketones (II) affords a tautomeric mixture (III)/(IV) of triazines. The ringchain transformation of these products is studied using NMR spectroscopy in DMSO-d 6 or mass-spectrometry in the gas-phase. Oxidation of the condensation products (independent on the ring-chain tautomer ratio) using lead tetraacetate provides a new access to 1,2,4-triazine-4-oxides (V). -(KOZHEVNIKOV,

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