Abstract
The diamine (NN) co-ligand 2,2-dimethyl-1,3-propanediamine and 2,3-diaminophathalene react individually with [RuCl2(dppb)2(μ-dppb)] to afford complexes with kinetically stable trans-[Cl2Ru(dppb)(NN)] as the favoured isomer. The thermodynamically stable cis-[Cl2Ru(dppb)(NN)] isomer of complex 1 was formed from the trans-1 isomer. The trans to cis isomerization reaction was conducted in CHCl3 at RT and monitored by 31P{1H} NMR. The structures of the desired complexes were characterized via elemental analyses, IR and, UV–visible spectroscopy, FAB-MS and NMR. The structure of the cis-1 isomer was determined by single crystal X-ray measurements. Both the trans-1 and cis-1 isomers were shown to have a significant catalytic role in selective hydrogenation reactions under mild conditions using cinnamic aldehyde as typical model reaction.
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