Abstract
A series of RNP(Pyrr)3 iminophosphoranes (P1 phosphazenes), where R is amino-, α-naphthyl- or substituted phenyl group, is prepared by the Kirsanov reaction and characterized by FT NMR and other properties. The ΔpKa-values of the 12 different synthesized phosphazenes and C6H5NP(NMe2)3 are determined in acetonitrile relative to the reference bases using 13C NMR spectroscopy. The obtained pKa-values are compared with the corresponding values of RNH2 amines. The pKa-values of the synthesized phosphazenes in acetonitrile range from 14.6 to 26.8 pKa units.
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