All three N‐methylated and N‐protonated hydroxypyridinium BArF4– salt isomers were synthesized and their hydrogen bond donating abilities were investigated. DFT and G4 theory computations along with IR spectroscopic measurements were found to be effective methods for predicting the catalytic activities of these O–H and N–H Brønsted acids. A UV‐vis titration approach for rapidly quantifying hydrogen
所有三个N-甲基化和N-质子化的
羟基吡啶鎓BAr F 4 –合成了各种盐异构体,研究了其氢键给体能力。发现DFT和G4理论计算以及红外光谱测量是预测这些OH和NHBrønsted酸的催化活性的有效方法。用UV-vis滴定法快速量化氢键的给定能力表明,碳氢键也可以参与静电相互作用,但是存在多个平衡络合物导致该方法的局限性。在羟
吡啶的甲基化系列中,相对于间位衍
生物,邻位和对位异构体显示出适度的速率增强。质子化引入了一个新的酸性位点,而邻
羟基吡啶鎓离子盐比所有其他被研究的物种具有明显更高的活性。