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The charge-transfer constant. A new substituent constant for structure-activity relationships
Journal of Medicinal Chemistry
|January 1, 1975
Summary
A novel charge-transfer constant (CT) quantifies aromatic systems' pi-complex formation. This CT constant, along with hydrophobicity, predicts inhibitor affinity for acetylcholinesterase.
Area of Science:
- Medicinal Chemistry
- Physical Organic Chemistry
Background:
- Aromatic systems are crucial in biological interactions.
- Quantifying pi-complex formation is vital for understanding structure-activity relationships.
Purpose of the Study:
- To introduce a new versatile constant for pi-complex formation ability.
- To demonstrate the utility of this constant in structure-reactivity studies.
Main Methods:
- Derivation of the charge-transfer constant (CT) from charge-transfer complex data.
- Application of CT and Hansch hydrophobicity constant (pi) in structure-reactivity analyses.
Main Results:
- A new CT constant is proposed for aromatic systems.
- The CT constant effectively predicts the affinity of inhibitors for acetylcholinesterase.
- Inhibitor affinity is shown to be a function of both CT and pi.
Conclusions:
- The proposed CT constant is a valuable tool for assessing pi-complex formation.
- CT and pi constants offer a predictive model for inhibitor-enzyme interactions.
- This work advances the understanding of structure-reactivity in medicinal chemistry.