Issue 20, 2006
From the journal:

Dalton Transactions

1,8-Dimethylnaphthalene-bridged diphosphine ligands: synthesis and structural comparison of their palladium complexes

Ronan M. Bellabarba,*a   Colin Hammond,†a   Grant S. Forman,a   Robert P. Toozea  and  Alexandra M. Z. Slawinb  

* Corresponding authors

a Sasol Technology (UK) Ltd, Purdie Building, North Haugh, St Andrews, Fife, UK
E-mail: ronan.bellabarba@uk.sasol.com
Fax: +44 (0)1334 460939
Tel: +44 (0)1334 460934

b School of Chemistry, Purdie Building, North Haugh, St Andrews, Fife, UK
E-mail: amzs@st-and.ac.uk
Fax: +44 (0)1334 463384
Tel: +44 (0)1334 467280

Abstract

The synthesis of a new series of ligands with a 1,8-dimethylnaphthalene backbone is reported, 1,8-(R2PCH2)2C10H6, where R = tBu 1 (dbpn), iPr 2 (dippn), Cy 3 (dchpn) and Ph 4 (dphpn). The ligand 1 is structurally characterised by X-ray crystallography. A comparative structural study of the respective (diphosphine)Pd(dba) and (diphosphine)PdCl2 complexes is carried out, comparing the X-ray crystal structures of complexes 6, 7, 8, 10, 11 and 12. It is shown that the geometry at the metal is affected by not only ligand demands, but also by the palladium oxidation state and the electronic properties of the ligands. Two qualitative stability series are also identified: 9 < 10 < 11 ≈ 12 is observed, and P2Pd(dba) complexes are more stable than the corresponding P2PdCl2 complexes towards opening of the chelate ring. It is also concluded that the bite angle is heavily influenced by the electron donating properties of the ligand.

Graphical abstract: 1,8-Dimethylnaphthalene-bridged diphosphine ligands: synthesis and structural comparison of their palladium complexes

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Article information

DOI
https://doi.org/10.1039/B600837B
Article type
Paper
Submitted
19 Jan 2006
Accepted
10 Mar 2006
First published
17 Mar 2006

Dalton Trans., 2006, 2444-2449

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1,8-Dimethylnaphthalene-bridged diphosphine ligands: synthesis and structural comparison of their palladium complexes

R. M. Bellabarba, C. Hammond, G. S. Forman, R. P. Tooze and A. M. Z. Slawin, Dalton Trans., 2006, 2444 DOI: 10.1039/B600837B

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