Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Mechanistic Significances of the Reactivity-Selectivity Principle

  • Published : 19950300
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Abstract

The relationship between the signs of ${\rho}i(0)$, ${\rho}j(0)$ and ${\rho}ij$ and validity of the reactivity-selectivity principle (RSP) has been derived: RSP is valid when W = ${\rho}i(0){\cdot}{\rho}j(0)/{\rho}ij$ is negative. The analysis of 100 reaction series indicated that for normal SN2 reactions involving variations of substituents in the nucleophile (X) and in the substrate (Y) RSP is valid only for a dissociative type for which ${\rho}Y(0)$ is negative, whereas for the acyl transfer reactions with rate-limiting breakdown of the tetrahedral intermediate RSP is valid in general for all substituent changes, X, Y and/or Z (substituent on the leaving group). The trends in the validity of RSP for certain types of reaction can be useful in supplementing the mechanistic criteria based on the signs of ${\rho}i(0)$, ${\rho}j(0)$ and ${\rho}ij$.

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