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1H and 19F PGSE diffusion and HOESY NMR studies on cationic palladium (II) 1,3-diphenylallyl complexes in THF solution

✍ Scribed by Ignacio Fernández; Paul S. Pregosin

Publisher: John Wiley and Sons
Year: 2005
Tongue: English
Weight: 158 KB
Volume: 44
Category: Article
ISSN: 0749-1581
DOI: 10.1002/mrc.1729

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✦ Synopsis

Abstract

THF solutions of the cationic chiral 1,3‐diphenylallyl bidentate phosphine complexes Pd(η^3^‐PhCHCHCHPh)(Duphos), Duphos = 1,2‐Bis‐((2R,5R)‐2,5‐dimethylphospholano)benzene), 2, and [Pd(η^3^‐PhCHCHCHPh)(P,S)]BF~4~, 4, P,S = [8‐((o‐(diphenylphosphino)benzyl) thiomethyl]—(7,7′‐dimethyl)‐exo‐norborneol, have been studied via pulsed gradient spin‐echo (PGSE) diffusion, ^1^H, ^19^F HOESY and a variety of other multi‐dimensional NMR methods. On the basis of the ^1^H, ^19^F HOESY data, the anions show a preference for a specific structural position with respect to the η^3^‐PhCHCHCHPh allyl ligand, i.e. the anion does not move evenly around the periphery of the cation. THF is shown to promote significant ion pairing, although neither 2 nor 4 shows 100% ion pairing. Copyright © 2005 John Wiley & Sons, Ltd.

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