1.3.5- Triazine-2,4-dithione

Pyridyl)-2//-pyrido[l,2- ][l,3,5]triazine-2,4(3//)-dithione 84 js the dimeric form of pyridylisothiocyanate 85. It exists as a brick-red crystalline dimer at ambient temperature, which dissociates to the pale yellow monomer 85 upon heating (Scheme 4) <2004JHC99>. 

NMR study of the thione—thiol tautomerism of a 1,3,5-triazine derivative (Scheme 14) showed that the dithione structure 36 is the predominant tautomer in both solution and solid state, despite the apparently reduced aromaticity.9... 

The electronic spectra of l,2,4-triazin-3-ones and l,2,4-triazine-3,5-diones were given at the beginning of Section 2.19.2.2. l,2,4-Triazine-3,5-dithiones (74) have two absorption maxima around 320 and 280 nm (62CCC1886). 3-Amino-1,2,4-triazine (39) has two absorption bands at 394 (e =505) and 310 nm (2370) the first is attributed to an band... 

Extensive studies on 1,2,4-triazines substituted with oxygen or sulfur in the 3- and 5-positions have shown that five distinct fragmentation patterns can be observed upon electron impact, but none involve initial loss of nitrogen. The following systems were studied l,2,4-triazine-3,5-diones (33), l,2,4-triazine-3,5-dithiones (74), 3-thioxo-l,2,4-... 

All 1,2,4-triazines containing a thioxo group either in the 3-, 5- or 6-position are alkylated by methyl iodide or dimethyl sulfate at the sulfur if this is possible. This observation is reported for l,2,4-triazine-3-thiones, -5-thiones, -3,5-dithiones, -3,5,6-trithiones, 3-thioxo-1,2,4-triazin-5 -ones, 5 -thioxo-1,2,4-triazin-3-ones, 5-amino-1,2,4-triazine-3-... 

Desulfurization of l,6-dihydro-l,2,4-triazine-3,5-dithiones (288) leads either to tetrahydro-l,2,4-triazin-3-ones (289) or to tetrahydro-l,2,4-triazines (290), depending on the conditions (70BSF1606). 

Mesomeric 1,3,5-triazine-dione, -one-thione and -dithione betaines may be synthesized from N,N -disubstituted acetamidines (Scheme 73) (75JHC187). Huffman and Schaefer have reported the synthesis of the triazine 1-oxide (137) in 45% yield from methyl N-cyanoacetimidate and benzamidoxime (equation 70) (63JOC1816). 

Reaction of benzoylacetylene with l,5-diphenyl-2,4-dithiobiuret in methanol yielded a hexahydro-l,3,5-triazine-2,4-dithione derivative, whilst this reaction in benzene afforded a... 

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