期刊
JOURNAL OF MOLECULAR STRUCTURE-THEOCHEM
卷 763, 期 1-3, 页码 133-144出版社
ELSEVIER
DOI: 10.1016/j.theochem.2006.01.022
关键词
Diels-Alder reaction; electrophilicity index; density functional theory; maximum hardness principle; minimum polarizability principle
The regioselectivity for a series of Diels-Alder reactions (67 reactions) has been studied using hardness, polarizability and electrophilicity of the corresponding products as global reactivity indexes. It is shown that in many cases, the maximum hardness and minimum polarizability principles (MHP and MPP) cannot predict the major regioisomer of a Diels-Alder reaction; whereas the analysis of global electrophilicities of the products shows that at least in those cases, which diffuse basis sets are used, the major product of the reaction has always the less electrophilicity values. It seems that there is a tendency in atoms to arrange themselves so that the obtained molecule reaches the minimum electrophilicity. This rule may be called the minimum electrophilicity principle (MEP). (c) 2006 Elsevier B.V. All rights reserved.
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