Trapping of a Highly Reactive Oxoiron(IV) Complex in the Catalytic Epoxidation of Olefins by Hydrogen Peroxide

2019 ◽  
Vol 131 (12) ◽  
pp. 4052-4056 ◽  
Author(s):  
Xenia Engelmann ◽  
Deesha D. Malik ◽  
Teresa Corona ◽  
Katrin Warm ◽  
Erik R. Farquhar ◽  
...  
2013 ◽  
Vol 68 (10) ◽  
pp. 1138-1142 ◽  
Author(s):  
Lilian R. Graser ◽  
Sophie Jürgens ◽  
Michael E. Wilhelm ◽  
Mirza Cokoja ◽  
Wolfgang A. Herrmann ◽  
...  

Polyoxomolybdates were generated in situ by treating a carboxylic acid-functionalized ionic liquid with an aqueous solution of sodium molybdate. This reaction mixture was applied in the catalytic epoxidation of olefins using hydrogen peroxide as oxidant. The influence of acid and catalyst concentration as well as of the reaction temperature was investigated. The system showed a good performance for the epoxidation reaction and can be reused several times without a significant loss of activity. We present an easy, cheap and environmentally friendly catalytic system for the epoxidation of cis-cyclooctene.


2008 ◽  
Vol 334 (1-2) ◽  
pp. 106-111 ◽  
Author(s):  
Valiollah Mirkhani ◽  
Majid Moghadam ◽  
Shahram Tangestaninejad ◽  
Iraj Mohammadpoor-Baltork ◽  
Esmaeil Shams ◽  
...  

RSC Advances ◽  
2015 ◽  
Vol 5 (81) ◽  
pp. 65870-65873 ◽  
Author(s):  
R. Dileep ◽  
B. J. Rudresha

A catalytic system consisting of copper complex and hydrogen peroxide in Emim ionic liquid medium was effective in the epoxidation of olefins and terpenes. The catalyst and the ionic liquid mixture was recycled and reused consistently.


2019 ◽  
Vol 58 (12) ◽  
pp. 4012-4016 ◽  
Author(s):  
Xenia Engelmann ◽  
Deesha D. Malik ◽  
Teresa Corona ◽  
Katrin Warm ◽  
Erik R. Farquhar ◽  
...  

2003 ◽  
Vol 2003 (5) ◽  
pp. 313-314 ◽  
Author(s):  
Hassan Hosseini Monfared ◽  
Mitra Ghadimi

A simple heterogeneous catalyst based on supporting iron(II) ions on γ-alumina was developed and successfully applied to the selective epoxidation of olefins with 35% aqueous H2O2 as an oxygen donor in CH3CN.


2009 ◽  
Vol 2009 (8) ◽  
pp. 527-532
Author(s):  
Manindranath Bera

Two new dinuclear nickel(ll) compounds of formula [Nill2(μ-L1)2](CIO4)2·MeCN (1·MeCN) and [NiII2(μ-L2)2](CIO4)2 (2) where HL1 and HL2 stand for 3-(2-(dimethylamino)ethylimino)butan-2-one oxime and 1-(2-(dimethylamino)ethyl-imino)-1-phenylpropan-2-one oxime respectively, have been synthesised. Single crystal X-ray analyses of the complexes reveal that the nickel(ll) ions are in square-planar N3O environments and form six-membered (NiNO)2 metallacycles. Cyclic voltammetric measurements of 1·MeCN and 2 in MeCN solution show quasirreversible one-electron oxidations at E1/2 = 0.566 V and 0.603 V ( vs Fc+/Fc), respectively, attributed to NiIIINiII/NiII2 redox couples. Additional reversible NiIII2/NiIIINiII redox responses were observed at relatively higher potential near E1/2 = 0.832 V and 0.850 V ( vs Fc+/Fc), respectively, for 1·MeCN and 2. Complexes 1·MeCN and 2 display intense charge-transfer bands at ∼390 and ∼345 nm in the visible region. Chemical oxidation of complex 1·MeCN by sodium hexachloroiridate(IV) hexahydrate generates red Ni2III species with characteristic new bands at ∼520 and 427 nm in the visible region as well as the characteristic EPR signals at 77 K with g⊥ > gII. Similar phenomena were observed for complex 2 upon chemical oxidation. The dinickel(ll) complexes are catalytically active for epoxidation of olefins using iodosylbenzene as the terminal oxidant.


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