The chemistry of 1,1-dithiolates: II. Formation of Thieno-1,2,3-triazines by diazotation of3-amino-thiophene-2 and 4-carboxamide

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A series of thieno[3,2-e]-3,4-dihydro-1,2,3-triazin-4-ones (V) and thieno[3,4-e]-3,4-dihydro-1,2,3-triazin-4-ones (VI) were prepared by diazotation of 3-aminothiophene-2-carboxamides (III) and 4-amino-thiophene-3-carboxamides (IV), respectively, both obtained by cyclization of 2-cyanoethylene-1,1-dithiolates with α-halogenocarbonyl compounds. Characteristic differences between the two systems were found in the position of the long-wavelength UV absorption maximum and the acidity of the triazine ring proton. The latter property was reflected in the 1H NMR signal from this proton.
OriginalsprogEngelsk
TidsskriftActa Chemica Scandinavica
Vol/bind26
Tidsskriftsnummer8
Sider (fra-til)3342-3346
Antal sider5
ISSN1477-9226
StatusUdgivet - 1972

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