Synthesis, characterization, crystal structure and chemical behavior of [1,1-bis(diphenylphosphinomethyl)ethene]ruthenium(II) complex toward primary alkylamine addition

Abstract

Reaction of the ruthenium phosphine complex [RuCl 2 (PPh 3 ) 3 ] 1 with an unsaturated functionalized diphosphine ligand, namely 1,1-bis(diphenyl-phosphinomethyl)-ethene, H 2 C=C(CH 2 PPh 2 ) 2 , (dppme) gave trans-Cl 2 Ru-(dppme) 2 2. Complex 2 served as a precursor for the synthesis of trans-Cl 2 Ru(dppme)(alkylamine) 2 complexes 3-5 by reaction with RNH 2 . All these complexes were characterized by spectroscopic techniques and by elemental analysis. The solid-state structure of complex 2 was determined by X-ray crystallography.

Crystal structure of cis-dichloro(1,2-R,R-diaminocyclohexane)-bis[1,3-(diphenylphosphino)propane]ruthenium(II), RuCl2(C27H26P2)(C6H14N2)

“…Metal complexes containing phosphorus ligands have always been important, due to their possible catalytic activity [2][3][4][5][6]. Recently, a ruthenium(II) complex system containing diphosphine and 1,2-diamine ligands of type RuCl 2/PP/NN was discovered, which in the presence of abase and 2-propanol, proved to be excellent catalysts for the hydrogenation of ketones under mild conditions [5,6].…”

“…Diphosphines such dppp are of the most versatile ligands, since they can stablize metal-phosphorus bonds and at the same time [1][2][3], very different functionalization may be introduced by means of the groups bound to the phosphorus atom [4,5]. Metal complexes containing phosphorus ligands have always been important, due to their possible catalytic activity [2][3][4][5][6].…”

Supported and Non-Supported Ruthenium(II)/Phosphine/[3-(2-Aminoethyl)aminopropyl]trimethoxysilane Complexes and Their Activities in the Chemoselective Hydrogenation of trans-4-Phenyl-3-butene-2-al

“…Preferential reduction of a C=O function over a coexisting C=C linkage is an important and difficult task. Although there are many examples of highly efficient catalysts for olefin and ketone reduction, imine hydrogenation is still a challenge in terms of both the turnover frequency and the lifespan of the active catalyst [ 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ]. One of the best transition-metal complexes for ketone hydrogenation that has been discovered is the chiral Ru(II)–diphosphine/1,2-diamine complex, which was developed by Noyori [ 3 ].…”

Kinetics and Mechanism of Oxidation ofL-Cysteine by Bis-3-di-2-pyridylketone-2-thiophenylhydrazone-iron(III) Complex in Acidic Medium

“…Transition metals in a higher oxidation state can generally be stabilized by suitable chelation of polydentate ligands to establish the proper complexes. Such of these complexes with ligand systems containing multidentate nitrogen or/ and phosphine-donor atoms have been used successfully to promote the transformation of organic compounds [3][4][5][6][7][8] . As oxidizing reagents metal chelates complexes such as hexacyanoferrate(III), dihydroxydiperdatonickelate(IV), bisenylendiamine-cobalt(II), chloramines-B and biphenyl-diamineruthenium(II) [9][10][11][12] have been used to oxidize cysteine in a medium with an appropriate pH value.…”