ChemInform Abstract: Catalytic Epoxidation of Alkenes with Oxone. Part 3. 6-Oxo-1,1,4,4-tetramethyl-1,4-diazepinium Salts. A New Class of Catalysts for Efficient Epoxidation of Olefins with Oxone.

ChemInform ◽  
2010 ◽  
Vol 29 (33) ◽  
pp. no-no
Author(s):  
S. E. DENMARK ◽  
Z. WU
Keyword(s):  
New Class ◽  
Catalytic Epoxidation ◽  
Epoxidation Of Alkenes ◽  
Epoxidation Of Olefins

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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