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Molecular Tree Topological Research on pKa Values of Substituted Carboxylic Acids
Author(s): FENG Changjun, WANG Chao
Pages: 53-
57
Year: 2004
Issue:
2
Journal: CHEMICAL RESEARCH
Keyword: 分子树; 拓扑指数; 干指数; 叶指数; 诱导指数; 羧酸; 酸性强度; 稳健性;
Abstract: 基于非氢原子i的酸性点价(δai)建构分子树拓扑指数(mT)及其分支指数(mTc)和叶指数(mTx),并提出表征诱导效应的叶指数(mT'x).通过最佳变量子集算法获得38种羧酸的pKa与0Tc、1Tc、0T'x的回归方程:pKa=3.0352-1.2570 0 0T'x-0.155 4 0Tc+0.078 1 1Tc,R=0.9766.通过Jackknife法检验,该模型具有总体稳健性.优于文献的七元最佳回归模型(R=0.957),与其分子力学方法(CoMFA)结果(R=0.988)较为接近.结果表明,所建拓扑指数是合理的,具有科学性基础.
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