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A 15N NMR Study of Protonation and Deprotonation of 4,5-Dicyanoimidazole and Its 2-Amino Analogue |
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| Authors: | J Klimkiewicz H Korczak L Stefaniak E Grech G A Webb |
| Institution: | 1. Institute of Organic Chemistry, Polish Academy of Sciences , ul. Kasprzaka 44/52, 01-224, Warsaw, 42 POB 58, Poland;2. Institute of Fundamental Chemistry, Technical University , ul. Piastów 42, 71-065, Szczecin, Poland;3. Departament of Chemistry , University of Surrey , Guildford, Surrey GU2 5XH, UK |
| Abstract: | Protonation and deprotonation of the title compounds, was studied by means of 15N NMR. The shieldings of the ring nitrogen atoms are found to be very sensitive to changes in the amount of protonation. In contrast the 15N shieldings of the cyano and amino groups are found to be relatively insensitive to protonation effects and are unsuitable for estimating the degree of protonation occurring. |
| Keywords: | 15N NMR protonation deprotonation 4 5-dicyanoimidazole |