# Solvent controlled anchimeric assistence in some nucleophilic substitutions at platinum (II) square planar derivatives

Rotondo , E. and Cusmano Priolo, F. and Neri, Giovanni (1983) Solvent controlled anchimeric assistence in some nucleophilic substitutions at platinum (II) square planar derivatives. Accademia Peloritana dei Pericolanti, Classe di Scienze FF. MM. NN., LXI. pp. 321-334.

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atti_3_1983_321.pdf - Submitted Version

Kinetic results concerning nucleophilic substitution of the chloride from the complexes [Pt (bipy) (am) Cl] $BPh_4$ (bipy=$\alpha \$,$\alpha \ ^'$—dipyridyl); am=ethanolamine and ethylamine) in methanol and acetonitrile are reported. The second order kinetic rate constants together with the solubilities of the reactants provide a basis for the calculation of the transfer chemical potentials for initial and transition state of every reported reaction. The kinetic behaviour of the two complexes is very similiar in methanol but in acetonitrile the ethanolamine derivative reacts about 2-3 times faster than the ethylamine derivative. This difference is interpreted on the basis of a solvent controlled anchimeric assistence which is provided to the leaving chloride by the dangling hydroxo-residue of the ethanolamine only in the aprotic acetonitrile.