作者:Feixiang Gao、Pengju Ji、Jin-Pei Cheng
DOI:10.1021/acs.joc.8b02183
日期:2018.12.21
The acidity ladder scale in [BMPY][NTf2] was successfully expanded toward the weak acidity region for about five more pK units compared to the previously established one. This allows the acidities of a series of 13 aliphatic and aromatic nitroalkanes to be determined accurately by the UV–vis spectroscopic method. The acidity of nitroalkane in [BMPY][NTf2] covers ∼8 pK units and is significantly weaker
与以前建立的p K单位相比,[BMPY] [NTf 2 ]中的酸度梯级成功地向弱酸性区域扩展了大约五个p K单位。这样可以通过紫外可见光谱法准确测定一系列13种脂肪族和芳香族硝基烷的酸度。[BMPY] [NTf 2 ]中硝基烷的酸度约为8 p K单位,明显弱于DMSO和水。4-取代的苯基硝基甲烷的Hammett图显示了出色的线性,斜率为2.06,与DMSO中的斜率相当接近,但比水中的斜率(0.80)大得多。回归分析表明,[BMPY] [NTf 2]关于C–H酸的酸性解离与DMSO相似。