作者:V. Praveen Kumar、Bishwajit Ganguly、Santanu Bhattacharya
DOI:10.1021/jo049539w
日期:2004.12.1
our calculated fep, pKa, and natural charge analysis results as well. In general, the introduction of electron-withdrawing substituents on 1-hydroxybenzotriazoles facilitates the lowering of pKa and fep. As the pKa values are lowered, a greater percentage of such hydroxybenzotriazoles remain in their deprotonated, anionic forms at pH 8.2. Since the anionic forms are nucleophilic, pKa lowering should enhance
1-羟基苯并三唑(1)和它的几个衍生物(25)表现出对活化的酯类,诸如有效的酯水解活性对-硝基苯基磷酸二苯酯(PNPDPP)和p硝基苯基己酸酯(PNPH)在阳离子胶束在pH 8.2和25℃ C。这种试剂的去质子化阴离子形式在酯的水解中充当反应性物质。合理化其亲核性,详细从头/ DFT计算研究已经执行的原点1 - 5用额外的羟基苯并三唑衍生物(沿6 - 13)。1-羟基苯并三唑的几何形状(1− 13)及其相应的基础进行了详细讨论。所有计算均使用不同的方法进行,即使用6-31G *和6-31 + G *基集的受限Hartree-Fock(RHF)和混合从头算/ DFT(B3LYP)。质子化的自由能在1-羟基苯并三唑的(“FEP”)(1 - 13),溶剂化Δ的自由能G ^水溶液相应的对,和ķ一个值已被计算。使用密度泛函理论和可极化连续体模型计算无溶剂化能量。此外,为了检验计算出的小便精的可靠性,