5.6- Dimethyl- 3-phenyl-1,2,4-triazine 4-oxide

The reaction of hydroxyamidrazone 134 with dimethylglyoxal in methanol leads to 5,6-dimethyl-3-phenyl-1,2,4-triazine 4-oxide 135 (71LA12). 

Peracetic acid oxidizes 3-phenyl-5,6-dimethyl-1,2,4-triazine 4-oxide to the... 

X-ray crystallographic analysis of 6-methyl-4-phenyl-l,2,3-triazine 1-oxide (8),22 1-methyl-4,6-diphenyl-l,2,3-triazinium iodide (9),23 4,6-dimethyl-l,2,3-triazine 2-oxide (10a),19 4,6-diphenyl-1,2,3-triazine 2-oxide (10b),19 4,5,6-triphenyl-l,2,3-triazine 2-oxide (10c),36 4,5,6-tris(4-tolyl)-... 

The bond energy E y and the bond length r are related by E y= 1/r thus, there should be a correlation between aromaticity indexes and resonance energies. Accordingly, a unified aromaticity index 7a has been defined (reference benzene 7a=100), and 7a=77 for 1, 86 for 1,2,4- and 100 for 1,3,5-triazine <1992T335>. From molecular dimensions, 7a = 77 has also been calculated for both 4,6-dimethyl- and 4-methyl-6-phenyl-l,2,3-triazine, 73.4 for 4,6-dimethyl-l,2,3-triazine 2-oxide, 76.0 for 4-methyl-6-phenyl-l,2,3-triazine 2-oxide, and 68.95 for 6-methyl-4-phenyl-1,2,3-triazine 1-oxide <1993T8441>. In this sense, N-oxidation is accompanied by a reduction in aromatic character. 

In GHEG-II(1996), the structure of l,6-dimethyl-4-phenyl-l,6-dihydro-l,2,3-triazine 2-oxide 28 had been mentioned to be reported in <1986GPB109>, but, in fact, it was published elsewhere <1985YZ1122>. 

While the parent 1,2,3-triazine 1 is reported not to react with OT-chloroperbenzoic acid (MCPBA) even after 3 days <1992H(33)631>, 4-methyl-1,2,3-triazine 86c, 4,6-dimethyl-l,2,3-triazine 17m, and 4-methyl-6-phenyl-l,2,3-tri-azine 17s gave mixtures of 1-oxides (minor) and 2-oxides (major) when treated with MCPBA or ACOH/H2O2. In contrast, 4,5,6-triphenyl- and 4,6-diphenyl-l,2,3-triazine gave solely the 2-oxides <1996CHEC-II(6)483>. 

Dimethyl-1,4-phenylene) bis [imino-carbonyl (2-hydroxy-3,1-naphthalenediyl) azo]] bis (4-methylbenzoic acid), bis (2-chloroethyl) ester Magnesium oxide Mica 1,r-[(6-Phenyl-1,3,5-triazine-2,4-diyl) diimino] bis-9,10-anthracenedione Phthalocyanine green Pigment black 28... 

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