期刊
JOURNAL OF ORGANIC CHEMISTRY
卷 68, 期 26, 页码 9988-9993出版社
AMER CHEMICAL SOC
DOI: 10.1021/jo034537h
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Eleven new phenyl-substituted phosphazenes (P-1-, P-3-, and P-4-bases) have been synthesized by the Staudinger or the Kirsanov reactions. The UV-vis spectrophotometric titration method was used to establish the relative basicity of them, and to extend the ion-pair basicity scale for THF medium. These measurements together with our previous work give a continuous basicity scale in THF ranging from 2.6 (2-MeO-pyridine) to 26.6 (2-Cl-C6H4P4(pyrr) phosphazene) in pK(alpha) units: that is for 24 orders of magnitude and containing 58 compounds (pyridines, anilines, amines, guanidines, amidines, phosphazenes). Ion-pair formation was taken into account by using the Fuoss equation. DeltapK(ip) values of some phosphazene indicators estimated earlier by the C-13 NMR method were revised. For some of the phosphazenes gas-phase basicities were measured.
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