O,N,O′-tridentate ligands derived from carbohydrates in the V(IV)-promoted asymmetric oxidation of thioanisole

Recent advances in vanadium catalyzed oxygen transfer reactions

“…Peroxo complexes prepared from Schiff-base complexes of oxovanadium(V) converted methyl phenyl sulfide in high yield but low ees (5-20%). Other Schiff bases have been obtained using sugars 27, 28 [26,27]. In the oxidation of thioanisole with hydrogen peroxide V(V)/27 complexes afforded ees up to 60% [26] while V(V)/28 ees up 26% (Fig.…”

“…Other Schiff bases have been obtained using sugars 27, 28 [26,27]. In the oxidation of thioanisole with hydrogen peroxide V(V)/27 complexes afforded ees up to 60% [26] while V(V)/28 ees up 26% (Fig. 8) [27].…”

Influence of the drying treatment on the performance of V–Nb mixed oxides catalysts synthesised via sol–gel

“…Many catalysts have been proposed to improve both conversion and selectivity [2,4]. In literature, the successful use of bulk and supported vanadium oxide based catalysts in the ODH of ethane, propane and butane with high activity, but poor selectivity, is reported [1,[4][5][6][7]. It is also reported that the catalytic behaviour of vanadium oxide is strongly affected by the interaction with the support and that the vanadium functionality is modified by the addition of P, Mg, Mo or Nb [2,3,8].…”

Nickel(II) complexes with Schiff-base ligands derived from epimeric pyranose backbones as 2,3-chelators: modeling the coordination chemistry of chitosan

“…[14][15][16][17][18][19][20] The Schiff-base formation is especially explored concerning their common availability via condensation of amino sugars with aldehyde moieties. [21][22][23][24][25][26][27][28][29] Herein the syntheses and crystal structures of the mononuclear nickel(II) complexes with Schiff-base ligands derived from the epimeric sugars glucosamine ðH 2 sal NO 2 GlcÞ and mannosamine (H 2 sal H Man) are reported. In the course of our investigations on the binding properties of chitosan toward transition metal ions, the complex ½NiðHsal NO 2 GlcÞðtptzÞClO 4 was prepared from the Schiff-base ligand derived from 2-amino-2-deoxy-D D-glucose representing the anhydro glucose unit of this polysaccharide together with 2,4,6-tri-(2-pyridyl)-1,3,5-triazine (tptz) as accompanying co-ligand.…”