Olefin isomerization reactions catalyzed by ruthenium hydrides bearing Schiff base ligands

Abstract

A series of in situ-generated ruthenium hydride complexes Ru(PPh 3 ) 2 (CO)H(L n ) (n = a-h) incorporating a Schiff base ligand was investigated for the isomerization of olefins. 1 H-NMR was used to characterize the new hydride species in combination with 31 P-NMR. Allylbenzene and 1-octene were used as model substrates. Temperature, solvents and catalyst/substrate mole ratio were taken into account as parameters to optimize the isomerization reaction. All catalysts showed the best performance in 2-butanol, suggesting that the catalytic activity depends not only strongly on the steric and electronic environment of the ruthenium but also on the chosen solvent.

Synthesis, characterization, crystal structure and predicting the second-order optical nonlinearity of a new dicobalt(III) complex with Schiff base ligand

“…These compounds form stable and variety complexes with the majority of transition metal ions that exhibit various electronic and structure characteristics [5][6][7][8][9]. Therefore, the research area containing the coordination compounds with azomethine ligands as main characters is widely expansive especially due to their potential interest roles in various interdisciplinary fields such as: structural features [10,11], efficient different catalytic processes in various organic reactions [12][13][14], models of the metal ion coordination sites in metalloproteins or enzymes at bioinorganic chemistry [15][16][17], magnetochemistry [18][19][20], corrosion inhibitors [21] and nonlinear optical materials [22][23][24]. Second-Order NLO organic materials such as Schiff base compounds have recently attracted attention owing to their potential applications in computers, optical communication and medical imaging [25,26].…”

Isomerization of Allylbenzenes

“…Verpoort and co-workers continued on this research theme by publishing results based on the ability displayed by a library of ruthenium hydride-bearing Schiff base ligands on the allylbenzene isomerization (Scheme 147). 729 Isomerizations were studied in a number of solvents, and the maximum conversion of allylbenzene 3 into 4 was observed when isomerization was carried out in 2-butanol at 80 °C. The researchers pointed out that the inertness of their catalysts, with respect to moisture and air, represented a significant advantage.…”

Alkene Isomerisation Catalysed by a Ruthenium PNN Pincer Complex

“…[12] Other examples are the isomerisation of allyl benzenes such as estragol or safrole, which are of great interest for the fragrance industry. [13,14] A wide range of isomerisation catalysts have been developed based on various metals such as Pd, [15][16][17] Ru, [18][19][20][21][22] Ti, [23][24][25] V, [26] Fe, [27][28][29] Rh, [30][31][32] Mo, [33] Ni, [34][35][36] etc., but also metal-free systems such as frustrated Lewis pairs. [37] One of the most active catalysts is the ruthenium-based "alkene zipper" developed by Grotjahn and co-workers.…”