IN SITU CATALYTIC EPOXIDATION OF OLEFINS WITH TETRAHYDROTHIOPYRAN-4-ONE AND OXONE: trans-2-METHYL-2,3-DIPHENYLOXIRANE

2002 ◽  
Vol 78 ◽  
pp. 225 ◽  
Keyword(s):  
Catalytic Epoxidation ◽  
Epoxidation Of Olefins

Epoxidation of Olefins Catalyzed by Polyoxomolybdates Formed in-situ in Ionic Liquids

2013 ◽  
Vol 68 (10) ◽  
pp. 1138-1142 ◽  
Author(s):  
Lilian R. Graser ◽  
Sophie Jürgens ◽  
Michael E. Wilhelm ◽  
Mirza Cokoja ◽  
Wolfgang A. Herrmann ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Ionic Liquid ◽  
Catalyst Concentration ◽  
Sodium Molybdate ◽  
Significant Loss ◽  
Catalytic Epoxidation ◽  
Epoxidation Reaction ◽  
Epoxidation Of Olefins

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.

Synthesis, characterisation and activity in catalytic epoxidation of olefins of new dinuclear nickel(ll) complexes

2009 ◽  
Vol 2009 (8) ◽  
pp. 527-532
Author(s):  
Manindranath Bera
Keyword(s):  
Visible Region ◽  
Chemical Oxidation ◽  
Cyclic Voltammetric ◽  
Catalytic Epoxidation ◽  
Redox Couples ◽  
Square Planar ◽  
Catalytically Active ◽  
Mecn Solution ◽  
Voltammetric Measurements ◽  
Epoxidation Of Olefins

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.

Oxorhenium(V) complexes with naphtholate-oxazoline ligands in the catalytic epoxidation of olefins

Polyhedron ◽  
2014 ◽  
Vol 75 ◽  
pp. 141-145 ◽  
Author(s):  
Belina Terfassa ◽  
Jörg A. Schachner ◽  
Pedro Traar ◽  
Ferdinand Belaj ◽  
Nadia C. Mösch Zanetti
Keyword(s):  
Catalytic Epoxidation ◽  
Oxazoline Ligands ◽  
Epoxidation Of Olefins

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 ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Catalytic Epoxidation ◽  
Epoxidation Of Olefins

Catalytic epoxidation of olefins in liquid phase over manganese based magnetic nanoparticles

2019 ◽  
Vol 48 (45) ◽  
pp. 16827-16843 ◽  
Author(s):  
Wenjuan Yan ◽  
Jinyao Wang ◽  
Jie Ding ◽  
Puhua Sun ◽  
Shuxia Zhang ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Liquid Phase ◽  
Olefin Epoxidation ◽  
Catalytic Epoxidation ◽  
Epoxidation Of Olefins

Olefin epoxidation over Mn supported on magnetic nanoparticles.

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