POLYNUCLEAR BRANCHED TETRAZOLE SYSTEMS. 2. NEW 2-(5-TETRAZOLYL)ETHYL PODANDS AND THEIR NH-ACIDITY

Authors

  • В. Ю. Зубарев St. Petersburg State Technological Institute (Technical University), St. Petersburg
  • Е. В. Безклубная St. Petersburg State Technological Institute (Technical University), St. Petersburg
  • А. К. Пяртман St. Petersburg State Technological Institute (Technical University), St. Petersburg
  • Р. Е. Трифонов St. Petersburg State Technological Institute (Technical University), St. Petersburg
  • В. А. Островский St. Petersburg State Technological Institute (Technical University), St. Petersburg

Keywords:

polynuclear NH-tetrazoles, acidity, multistep ionization, Bjerrum function

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 pKa1, pKa2, pKa3 , and pKa4 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.

How to Cite
Zubarev, V. Yu.; Bezklubnaya, E. V.; Pyartman, A. K.; Trifonov, R. E.; Ostrovskii, V. A. Chem. Heterocycl. Compd. 2003, 39, 1317. [Khim. Geterotsikl. Soedin. 2003, 1496.]

For this article in the English edition, see DOI 10.1023/B:COHC.0000010646.77507.bb

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Published

2003-10-25

Issue

No. 10 (2003)

Section

Original Papers