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Activation of Oximic Nucleophiles by Coordination of Transition Metal Ions

✍ Scribed by Fabrizio Mancin; Paolo Tecilla; Umberto Tonellato

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
265 KB
Volume
2000
Category
Article
ISSN
1434-193X

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✦ Synopsis

A kinetic study of the reactivity in the cleavage of pnitrophenyl acetate of a series of 2-pyridineoximes, 1Οͺ4, and their complexes with Ni II , Zn II and Cu II is reported. Complexation of the oximic ligands leads to a remarkable increase in the acidity of the oximic group, following the order Cu II ΟΎ Ni II ΟΎ Zn II . The oximates of free ligands and their metal complexes, being Ξ±-nucleophiles, are quite effective in promoting the cleavage of PNPA. However, the reactivity, as defined by the second-order rate constants, is not predictably related to the acidity of the oximic function.

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