A new route to α,ω-diamines from hydrogenation of dicarboxylic acids and their derivatives in the presence of amines

We thank the EPSRC for the critical mass grant 'Clean Catalysis for Sustainable Development' (EP/J018139/1), Sasol Technology, UK for a case studentship (Y. S.) and the EPSRC UK National Mass Spectrometry Facility at Swansea University for mass spectrometric analysisA new and selective route for the synthesis of polymer precursors, primary diamines or N-substituted diamines, from dicarboxylic acids, diesters, diamides and diols using a Ru/ triphos catalyst is reported. Excellent conversions and yields are obtained under optimised reaction conditions. The reactions worked very well using 1,4-dioxane as solvent, but the greener solvent, 2-methyl tetrahydrofuran, also gave very similar results. This method provides a potential route to converting waste biomass to value added materials. The reaction is proposed to go through both amide and aldehyde pathways.PostprintPeer reviewe

Enzyme Activity by Design: An Artificial Rhodium Hydroformylase for Linear Aldehyes

Data files relating to the paper ' Enzyme Activity by Design: An Artificial Rhodium Hydroformylase for Linear Aldehyes' published in Angew. Chem. Int. Ed

Solid-Phase Synthesis of Recyclable Phosphorus Donor Ligands for the Development of Immobilized Transition-Metal Catalyst Libraries (Thesis data)

Data deposited contain FIDs of NMR spectra and IR spectra of compounds presented in the thesis. An NMR/IR software is required

Cis, Trans, or Both: Steric Bulk Determines Coordination Mode of Dimeric Palladium Complexes with Bridging Phosphine-Pyridyl Ligands.

The coordination mode in a metal complex is critically dependent on the ligands surrounding the metal, on the precursors used, and on the conditions during synthesis. Our goal was to obtain palladium compounds with pyridine-phosphane ligands for catalysis. Therefore, we synthesized ligands 1a-d, which differ in the bulky aryl substituent at the pyridyl moiety. The palladium complexes 6a-d of these ligands are insoluble and have been characterized by various techniques, including solid-state NMR and (for 6a, b, and d) single-crystal X-ray diffraction, showing that bimetallic complexes are formed in which two ligands span two palladium centers. The configuration around these centers is determined by the steric bulk of the ligand. In complexes 6c,d, with the ligands bearing the largest steric groups, both centers have a trans configuration of the methyl and chloride anions. With intermediately sized pyridyl substituents, complex 6b is formed, having one cis surrounded and one trans-surrounded palladium center in the molecule. This kind of complexation has not been observed before. With the least bulky ligand, complex 6a is formed. Depending on the synthetic conditions employed, the methyl and the chloride in this complex can be in a cis configuration at both palladium atoms, or show the unique cis-trans coordination. (C) Wiley-VCH Verlag GmbH &amp; Co. KGaA, 69451 Weinheim, Germany, 2008)</p

Chiral wide bite angle diphosphine ligands: synthesis, coordination chemistry and application in Pd-catalyzed allylic alkylation (dataset)

CCDC 1059267-105926