Ion Pair p<i>K</i>s of Some Amines: Extension of the Computed Lithium p<i>K</i> Scale
作者:Andrew Streitwieser、Antonio Facchetti、Linfeng Xie、Xingyue Zhang、Eric C. Wu
DOI:10.1021/jo202253q
日期:2012.1.20
The pK of p-(methylamino)biphenyl, 1, on our Li scale, pK(Li) = 22.09, compared to the cesium scale, pK(Cs) = 28.60. For hexamethyldisilazane, HMDS, pK(Li) = 23.05, pK(Cs) = 29.26. These results are those for the monomers in THF; corrections were made for dimers present in some cases. The pK(Li) of these two amines fit well the previously found correlation with Hartree-Fock calculations at 6-31+g(d) using RLi coordinated with three dirnethyl ethers as a computational model for RLi in THF. The results are also compared with earlier pK(Li)s reported from equilibria with lithium amides in which aggregation was not considered.