Catalytic activity of manganese(III)-oxazoline complexes in urea hydrogen peroxide epoxidation of olefins: The effect of axial ligands

Bagherzadeh, M ; Sharif University of Technology | 2006

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  1. Type of Document: Article
  2. DOI: 10.1016/j.molcata.2006.07.023
  3. Publisher: 2006
  4. Abstract:
  5. The catalytic activity of two manganese(III)-oxazoline complexes [Mn(phox)2(CH3OH)2]ClO4 and Mn(phox)3 (Hphox = 2-(2′-hydroxylphenyl)oxazoline), was studied in the epoxidation of various olefins. All of epoxidation reactions were carried out in (1:1) mixture of methanol:dichloromethane at room temperature using urea hydrogen peroxide (UHP) as oxidant and imidazole as co-catalyst. The epoxide yields clearly demonstrate the influence of steric and electronic properties of olefins, the catalysts and nitrogenous bases as axial ligand. [Mn(phox)2(CH3OH)2]ClO4 catalyst with low steric properties has higher catalytic activity than Mn(phox)3. The highest epoxide yield (95%) was achieved for indene at the presence of [Mn(phox)2(CH3OH)2]ClO4 within 5 min. The proximal and distal interactions of strong π-donor axial ligands such as imidazole with the active intermediate are efficiently increased activity of the catalytic system. © 2006 Elsevier B.V. All rights reserved
  6. Keywords:
  7. Catalysis ; Catalyst activity ; Electronic properties ; Hydrogen peroxide ; Olefins ; Oxidation ; Axial ligands ; Epoxidation ; Manganese(III) oxazoline ; Urea hydrogen peroxide ; Manganese compounds
  8. Source: Journal of Molecular Catalysis A: Chemical ; Volume 260, Issue 1-2 , 2006 , Pages 163-169 ; 13811169 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/pii/S138111690601017X