Selective synthesis of binuclear N-substituted tetrazoles and tetrazolium salts
作者:P. N. Gaponik、S. V. Voitekhovich、A. S. Lyakhov
DOI:10.1007/bf02256871
日期:2000.3
Basicity of isomeric ditetrazolylbenzenes and their N-tert-butyl derivatives
作者:E. A. Popova、A. V. Ivanova、R. E. Trifonov、E. V. Popov、V. Yu. Zubarev、I. V. Tselinskii、V. A. Ostrovskii
DOI:10.1134/s1070428007040173
日期:2007.4
The basicity constants (pK(BH+), pK(BH2+)) of 1,2-, 1,3-, and 1,4-bis(tetrazol-5-yl) benzenes and their N-tert-butyl derivatives in aqueous sulfuric acid and the dissociation constants (pK(HB)) of the corresponding H-complexes with p-fluorophenol in carbon tetrachloride were determined by UV and IR spectroscopy. Mono- and diprotonation of isomeric ditetrazolylbenzenes is observed in the acidity range (H-0) from -1 to -5 (pKBH+ -2.5 to -3.0; pK(BH2+) -3.8 to -4.9). Introduction of a tert-butyl group into the 2 position of the heteroring almost does not affect the basicity of ditetrazolyl benzenes. Among the examined compounds, 1,2-bis(2-tertbutyltetrazol5- yl) benzene is the strongest proton acceptor with respect to p-fluorophenol as standard proton donor, presumably due to formation of a complex with bifurcated (three-center) hydrogen bond.