Reaction of the dilithium salt of the Schiff-base N,N'-o-phenylene-bis(3,5-di-tert-butyl-salicylidene-imine) ((t)Bu(4)salophenH(2)) with 1 equiv. of ZrCl4(THF)(2) in toluene at -78 degrees C affords the dichloro complex ZrCl2[C6H4-1,2-{N=CH-(3,5-(Bu2C6H2)-Bu-t-2-O)}(2)], isolated as a mixture of the C-2v-(3a) and C-2-(3b) symmetry isomers. Thermodynamic and kinetic parameters for the equilibrium between 3a and 3b have been determined and studied by H-1 NMR spectroscopy. Reactions of ZrCl2[C6H4-1,2-{N=CH-(3,5-(Bu2C6H2)-Bu-t-2-O)}(2)] with alkylating reagents gave an intractable, unidentified mixture of products from which the NMR spectra in C6D6 solution are unusable. (c) 2006 Elsevier B.V. All rights reserved.

A zirconium dichloro complex supported by an ancillary stereorigid tetradentate bis(phenoxo-imino) Schiff-base-donor ligand: Evidence for a conformational equilibrium between two solution stereoisomers

CUOMO, Cinzia;GRASSI, Alfonso
2006

Abstract

Reaction of the dilithium salt of the Schiff-base N,N'-o-phenylene-bis(3,5-di-tert-butyl-salicylidene-imine) ((t)Bu(4)salophenH(2)) with 1 equiv. of ZrCl4(THF)(2) in toluene at -78 degrees C affords the dichloro complex ZrCl2[C6H4-1,2-{N=CH-(3,5-(Bu2C6H2)-Bu-t-2-O)}(2)], isolated as a mixture of the C-2v-(3a) and C-2-(3b) symmetry isomers. Thermodynamic and kinetic parameters for the equilibrium between 3a and 3b have been determined and studied by H-1 NMR spectroscopy. Reactions of ZrCl2[C6H4-1,2-{N=CH-(3,5-(Bu2C6H2)-Bu-t-2-O)}(2)] with alkylating reagents gave an intractable, unidentified mixture of products from which the NMR spectra in C6D6 solution are unusable. (c) 2006 Elsevier B.V. All rights reserved.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11386/3041022
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