Polynuclear Branched Tetrazole Systems. 2. New 2-(5-Tetrazolyl)ethylpodands and Their NH-Acidity |
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| Authors: | V Yu Zubarev E V Bezklubnaya A K Pyartman R E Trifonov V A Ostrovskii |
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| Institution: | (1) Saint Petersburg State Technological Institute (Technical University), Saint Petersburg, 198013, Russia |
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| Abstract: | Nine new polynuclear 2-(5-tetrazolyl)ethyl podands have been obtained by the azidation of the corresponding nitriles. Using Bjerrum distribution functions, the values of pK
a
1, pK
a
2, pK
a
3, and pK
a
4 have been determined by a potentiometric method for 14 polynuclear tetrazoles in aqueous and aqueous methanolic solution. The found values lie in the range from 3.5 to 7.5 pH units. The overall rules and the sequence of the ionization of the spatially separated tetrazole fragments in these podand systems are discussed. |
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| Keywords: | polynuclear NH-tetrazoles acidity multistep ionization Bjerrum function |
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