Coordination and Catalytic Activity of Ruthenium Complexes Containing Tridentate P,N,O Ligands
Resource
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, 31, 4801-4806
Journal
European Journal of Inorganic Chemistry
Journal Issue
31
Pages
4801-4806
Date Issued
2011
Date
2011
Author(s)
Abstract
Abstract The coordination chemistry of Ru II ions with [2‐(diphenylphosphanyl)‐ N ‐( o ‐hydroxybenzylidene)]aniline ( PNO‐H ) and the methylated analogue PNO‐Me have been studied. Thus, [( PNO )RuCl(dmso) 2 ] ( 1 ), [( PNO ) 2 Ru] ( 2 ), [( PNO )RuCl(PPh 3 )] ( 3 ) and [( PNO )RuCl(CO) 2 ] ( 4 ) were synthesized by reactions of various Ru II precursors with PNO‐H . Treatment of PNO‐Me with [RuCl 2 (dmso) 4 ] resulted in in the formation of [ P , N ‐( PNO‐Me )Ru(dmso) 2 Cl 2 ] ( 5 ). However, complexation of PNO‐Me with [RuCl 2 (CO) 3 (THF)] (THF = tetrahydrofuran) provided a mixture of [ P , N ‐( PNO‐Me )Ru(CO) 2 Cl 2 ] ( 6 ) and 4 because O ‐demethylation took place during the reaction. All of the Ru II complexes have been characterized by elemental analysis and spectroscopic techniques, as well as X‐ray crystal structural analysis for 2 , 4 and 6 . The ruthenium complexes investigated in this work, except 2 , are good precatalysts for the reductive amination of amine with alcohols, and 4 appears to be the best. Moreover, 4 can catalyze the direct amination of nitrobenzene with benzyl alcohol to the corresponding secondary amine.
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journal article
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