Synthesis of N-aryl-substituted iminophosphoranes and NMR spectroscopic investigation of their acid–base properties in acetonitrile
作者:Toomas Rodima、Vahur Mäemets、Ilmar Koppel
DOI:10.1039/b003575k
日期:——
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 ÎpKa-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.
通过基尔萨诺夫反应制备了一系列 RNP(Pyrr)3 亚氨基磷烷(P1 磷氮烷),其中 R 为氨基、δ-萘基或取代苯基,并通过傅立叶变换核磁共振和其他性质对其进行了表征。利用 13C NMR 光谱测定了 12 种不同合成的磷杂环烯和 C6H5NP(NMe2)3 在乙腈中相对于参考碱的 pKa 值。得到的 pKa 值与 RNH2 氨基酸的相应值进行了比较。合成的膦氮化合物在乙腈中的 pKa 值介于 14.6 至 26.8 pKa 单位之间。