Objective: It is known that the electronegativities of functional groups can be
significantly to used predict the reaction mechanisms and to explain inductive effects of
Method: Bratsch equation is one of the most important equations used to calculate the
electronegativities of functional groups.
Conclusion: In the present study, some important comments and contributions related to
Bratsch's group electronegativity equation are presented. In addition, it is proposed that
absolute electronegativity should be considered in comparison of inductive effects of
Keywords: Bratsch equation, chemical hardness, conceptual density functional theory, electronegativity,
group electronegativity, sanderson's electronegativity equalization principle.
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