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Molecular connectivity and steric parameters

W J Murray

    Journal of Pharmaceutical Sciences
    |September 1, 1977
    PubMed
    Summary
    This summary is machine-generated.

    This study explored the link between molecular connectivity indexes (mchi) and steric effect parameter (Es). Significant correlations were found between extended chi terms and Es, with deviations noted for aralkyl esters.

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    Area of Science:

    • Quantitative Structure-Activity Relationships (QSAR)
    • Medicinal Chemistry
    • Organic Chemistry

    Background:

    • Molecular connectivity indexes (mchi) quantify molecular structure.
    • Es parameter estimates steric effects in reactions.
    • Both are used in biological structure-activity relationships (SAR).

    Purpose of the Study:

    • Investigate the relationship between mchi and Es.
    • Determine the predictive power of mchi for steric effects.
    • Identify potential limitations in using mchi for SAR.

    Main Methods:

    • Calculated extended chi terms (2chi, 3chi, 4chi).
    • Correlated chi terms with the Es parameter.
    • Analyzed deviations from established correlations.

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    Main Results:

    • Strong significant correlations found between extended chi terms and Es (r = 0.961).
    • Aralkyl esters showed deviations from the general correlation.
    • Intramolecular interactions were hypothesized as a cause for deviations.

    Conclusions:

    • Extended chi terms are effective predictors of steric effects (Es).
    • Aralkyl esters require specific consideration due to intramolecular interactions.
    • This work refines the application of mchi in QSAR and reaction modeling.