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Multiphilic descriptor for chemical reactivity and selectivity

机译:化学反应性和选择性的多亲描述符

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摘要

In line with the local philicity concept proposed by Chattaraj et al. (Chattaraj, P. K.; Maiti, B.; Sarkar, U. J. Phys. Chem. A. 2003, 107, 4973) and a dual descriptor derived by Morell, Grand and Toro-Labbe, (J. Phys. Chem. A 2005, 109, 205), we propose a multiphilic descriptor. It is defined as the difference between nucleophilic (omega(+)(k)) and electrophilic (omega(-)(k)) condensed philicity functions. This descriptor is capable of simultaneously explaining the nucleophilicity and electrophilicity of the given atomic sites in the molecule. Variation of these quantities along the path of a soft reaction is also analyzed. Predictive ability of this descriptor has been successfully tested on the selected systems and reactions. Corresponding force profiles are also analyzed in some representative cases. Also, to study the intra- and intermolecular reactivities another related descriptor, namely, the nucleophilicity excess (Delta omega(f)(g)) for a nucleophile over the electrophilicity in it, has been defined and tested on all-metal aromatic compounds.
机译:符合Chattaraj等人提出的当地慈善理念。 (Chattaraj,PK; Maiti,B .; Sarkar,UJ Phys。Chem。A. 2003,107,4973)和由Morell,Grand和Toro-Labbe衍生的双重描述符(J. Phys。Chem。A 2005,109 (205),我们提出了一个多义描述符。它定义为亲核(omega(+)(k))和亲电子(omega(-)(k))浓缩亲和函数之间的差异。该描述符能够同时解释分子中给定原子位点的亲核性和亲电子性。还分析了这些量沿软反应路径的变化。该描述符的预测能力已在所选系统和反应中成功测试。在某些典型情况下,也分析了相应的力分布。另外,为了研究分子内和分子间的反应性,已经定义并测试了全金属芳香族化合物并测试了另一个相关的描述词,即亲核试剂相对于亲核试剂的亲核试剂过量(Δomega(f)(g))。

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