L. Canovese, F. Visentin, C. Santo
Jun 10, 2010
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0
Influential Citations
26
Citations
Journal
Organometallics
Abstract
The ligands 8-diphenylphosphanylquinoline (DPPQ) and 8-diphenylphosphanyl-2-methylquinoline (DPPQ-Me) react in chlorinated solvents with the allyl dimers [Pd(μ-Cl)(η3-C3H5)]2 and [Pd(μ-Cl)(η3-C3H3Me2)]2, yielding palladium allyl phosphanylquinoline complexes whose structure is strongly influenced by the ancillary ligand and the presence or the absence of chloride ion in solution. Thus, the allyl fragments in the DPPQ derivatives assume η3-hapticity in the absence of chloride and display monohapto coordination when the chloride is not removed from the reaction mixture. In the DPPQ-Me allyl derivatives the allyl fragment is always η3-coordinated, while the ancillary ligand may act as bis- or monochelating in the absence or in the presence of chloride, respectively. The reactivity of the allyl complexes was tested by means of the allyl-amination reaction carried out by either NMR or UV−vis techniques. It was noticed that the η3-derivatives generally display a higher reactivity than their η1-allyl analogues, ...