engleski

ELECTROFUGALITIES OF SOME FERROCENYLBENZYL CATIONS

Electrofugalites of ferrocenylbenzyl cations have been derived from the SN1 solvolysis rate constants of corresponding ferrocenylbenzyl acetates and benzoates by applying the LFER equation: log k = sf (Ef + Nf) in which: k is a first-order rate constant for SN1 reaction, sf (slope of the log k /Ef correlation line) and Nf (nucleofugality ; negative intercept on the abscissa) are nucleofuge specific parameters, and Ef is the electrofugality parameter. Nucleofugality parameters (Nf and sf) of benzoate and acetate in various solvents, including acetone and acetonitrile, and appropriate kinetics information have been used for calculating Ef values. Due to ability of the ferrocene moiety to efficiently stabilize positive charge, ferrocenylbenzyl cations constitute a group of very powerful electrofuges in comparison with similar benzhydryl electrofuges.

Electrofugality ; nucleofugalty ; ferrocenylphenylmethyl cation ; solvolysis

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