New ruthenium(II) complexes having acac (=acetylacetonato) and diphenyl-2-pyridylphosphine as ligands proved to be excellent catalysts for hydration of nitriles to amides under neutral conditions. Among the ruthenium complexes examined, cis -Ru(acac) 2 (PPh 2 py) 2 exhibited the highest activity, with a turnover frequency of up to 20 900 (mol of amide)/((mol of catalyst) h).
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Oshiki et al. (2005) studied this question.