Is There a Minimum Electrophilicity Principle in Chemical Reactions?

• 来源期刊: 中国化学(英文版)
• 年，卷（期）: 2007,（10）
• 页码范围: 1439-1444
• 页数: 6页
• 语种: 英文

摘要

For 25 simple reactions, the changes of the hardness (△η), polarizability (△α) and electrophilicity index (△ω)and their cube-roots (△η1/3, △α1/3, △ω1/3) were calculated. It is shown that although the Maximum Hardness and Minimum Polarizability Principles are not valid for all reactions, but in most cases △ω1/3＜0, whereas we always find △ω＜0. Our observation impliesto this fact that for those chemical reactions in which the number of moles decreases or at least remains constant, the most stable species (reactants or products) have the lowest sum of electrophilicities. In other words "the natural direction of a chemical reaction is toward a state of minimum electrophilicity". This fact may be called Minimum Electrophilicity Principle (MEP).