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Is There a Minimum Electrophilicity Principle in Chemical Reactions?
Author(s) -
NOORIZADEH Siamak
Publication year - 2007
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200790266
Subject(s) - chemistry , electrophile , polarizability , computational chemistry , simple (philosophy) , chemical reaction , cube (algebra) , thermodynamics , organic chemistry , molecule , geometry , catalysis , philosophy , physics , mathematics , epistemology
For 25 simple reactions, the changes of the hardness (Δ η ), polarizability (Δ α ) and electrophilicity index (Δ ω ) and their cube‐roots (Δ η 1/3 , Δ α 1/3 , Δ ω 1/3 ) were calculated. It is shown that although the Maximum Hardness and Minimum Polarizability Principles are not valid for all reactions, but in most cases Δ ω 1/3 <0, whereas we always find Δ ω <0. Our observation implies to 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).