siloxane polymer

Hikmat S. Hilal's picture

Investigation of the Catalytic Activity of Poly (Siloxane)-Supported Tetra (4-Pyridyl) Porphyrinatomanganese (III) in Olefin Oxidation Reactions

Journal Title, Volume, Page: 
Journal of Molecular Catalysis Volume 81, Issue 2, 10 May 1993, Pages 157-165
Year of Publication: 
1993
Authors: 
Hikmat S. Hilal
Department of Chemistry, An-Najah N. University, Nablus, PO Box 7, West Bank, Palestine
Current Affiliation: 
Department of Chemistry, An-Najah N. University, Nablus, PO Box 7, West Bank, Palestine
C. Kim
Department of Chemistry, North Carolina State University, Raleigh, NC 27695-8204 USA
A. F. Schreiner
Department of Chemistry, North Carolina State University, Raleigh, NC 27695-8204 USA
Preferred Abstract (Original): 

Supported tetra(4-pyridyl)porphyrinatomanganese(III), [MnIII (TPyP)]+, has been used as a chemically regenerated catalyst for the oxidation of cyclohexene to cyclohex-2-en-1-one. NaBH4 was used to reduce [MnIII(TPyP)]+ back to its catalytically active MnIII form. The reaction was selective to produce the cyclohexenone, and the catalyst showed high activity, with turnovers up to 14 × 103. The effects of solvent, temperature, recovery, and reactant concentrations on the rate of the reaction have also been studied. The rate of the reaction was first order with respect to the catalyst. At higher olefin or oxygen concentrations the reaction was slower. A slower reaction was observed also in the absence of NaBH4. The reaction was faster in nonpolar solvents than in polar ones. These results are also discussed.

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