1.2.3.4- Thiatriazoles synthesis

Benzimidazolo[l, 2-c]thiatriazoles synthesis, 6, 612 Benz[cd]indazole antiaromaticity, 5, 208 Benz[cd]indazole, dihydroaromaticity, 5, 208 Benz[e]i ndolizine synthesis, 4, 466 Benzipiperylon biological activity, 5, 296 Benz[/]isoindoles synthesis, 4, 266... 

Three Nitrogen Atoms and One Sulfur Atom Thiatriazoles, synthesis from hydrazines 84H(22)1821. 

Synthesis of cross-conjugated mesomeric betaines containing l-oxo-l//-pyrazolo[l,2-tf]pyrazol-4-ium-3-olate, 1-oxo-1 //-pyrazolof 11.2,4]triazol-4-ium-3-olate, 7-oxo-7//-pyrazolo[l,2-tf][l,2,4]triazol-4-ium-5-olate, 7-oxo-7.//-pyrazolo[ 1.2-//][ 1.2.3 ]mazol-4-ium-5-olate, 3-oxo-3//-pyrazolo[l,2- ][l,2,3,5]thiatriazol-8-ium-l-olate, and 2-hydroxy-pyrazolof 1.2-//][ 1.2.5]m.izin-5-iumH-olate structures was duly covered in CHEC-II(1996) <1996CHEC-II(8)747> and... 

While the neutral 1,2,3,4-oxatriazoles (1) still await synthesis, some of their properties have been predicted by theoretical calculations. AMI calculations combined with a principal component analysis loading data from other related heteroaromatics have been used to estimate geometric characteristics, aromaticity, energy of formation, and N chemical shifts <90JPR885>. The oxatriazoles (1) and (7) and the 1,2,3,5-thiatriazoles, which also have not been prepared, are calculated to be in the group with the lowest classical and magnetic aromaticity. 

SYNTHESIS OF PARTICULAR CLASSES OF COMPOUNDS 4.19.9.1 Complex Formation of 1,2,3,4-Thiatriazol-5-thiol... 

The structures of 1,2,3,5-thiatriazole heteropentalenes are deduced from the mode of synthesis and from spectroscopic data <80JOC4065>. 

The first synthesis of ethyl cyanate48 from 5-ethoxythiatriazole49 was briefly mentioned in the previous review of thiatriazoles.1 The thiatriazole decomposes smoothly in ethereal solution at 20° with formation of nitrogen, sulfur, and ethyl cyanate. Although several other methods are now available for the preparation of both alkyl and aryl cyanates the thiatriazole method prevails as the most generally applicable for the thermally and chemically sensitive alkyl cyanates, since the only by-products are inert—sulfur and nitrogen. Thus a number of 5-alkoxy,50-54 5-aryloxy,55-57 and 5-aralkoxythiatriazoles12,53 have been prepared. 

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