[MCl(ligand)]+ Complexes (M = Ni, Pd, Pt) with a P,N,N Terdentate Ligand – Solid State and Solution Structures and Catalytic Activity of the PdII Derivative in the Heck Reaction
✍ Scribed by Alessandro Del Zotto; Ennio Zangrando; Walter Baratta; Alessandro Felluga; Paolo Martinuzzi; Pierluigi Rigo
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 159 KB
- Volume
- 2005
- Category
- Article
- ISSN
- 1434-1948
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✦ Synopsis
Abstract
Ni^II^, Pd^II^ and Pt^II^ cationic complexes of the general formula [MCl(PNN)]PF~6~, where PNN is the terdentate ligand N‐[2‐(diphenylphosphanyl)benzylidene][2‐(2‐pyridyl)ethyl]amine, have been synthesised and fully characterised in solution by NMR spectroscopy. The diamagnetic Ni^II^ complex 1 shows fluxionality, which can be attributed to a conformational rearrangement of the two six‐membered chelate rings. On the contrary, the Pd^II^ 2 and Pt^II^ 3 derivatives are stereochemically rigid on the NMR timescale. The crystal structures of 1 and 2 are reported, which show a planar geometry for both complexes. Complex 2 has been investigated as a precatalyst in the Heck coupling between styrene and bromobenzene. Interestingly, the nature of the solvent has a critical role in determining the yield of the reaction product. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)