Chemical oxygen demand of some nitrogenous heterocyclic compounds |
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Authors: | J Chudoba J Dalešický |
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Affiliation: | Department of Water and Environmental Technology, Institute of Chemical Technology, Prague 6, Czechoslovakia |
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Abstract: | Chemical oxygen demands of fourteen nitrogenous compounds were determined by the dichromate method. Only pyridine and its derivatives were resistant to oxidation. Heterocyclic compounds containing one atom of nitrogen in a molecule, e.g. quinoline, pyrrole, proline, and indole were 90–100 per cent oxidized. Nitrogen is split off these compounds as NH3. Heterocyclic compounds containing two or more atoms of nitrogen in a molecule are also easily oxidized. However, only a part of the nitrogen is split off as NH3. On the basis of the results obtained it is possible to make the following generalization: nitrogen in amino groups is split off mostly as NH3; quinoline, pyrrole, pyrrolidine, and indole nitrogen is split off as NH3; from imidazole and pyrimidine rings, one atom of nitrogen is split off as NH3 and one as N2; from the purine configuration, two atoms of nitrogen are split off as NH3 and two atoms as N2; from isoalloxazine, three atoms of nitrogen are split off as NH3 and one as N2. |
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