Effect of Fifth Coordination in Catalytic Epoxidation by a Chiral Manganese Porphyrin

Synlett ◽  
2002 ◽  
Vol 2002 (9) ◽  
pp. 1475-1478 ◽  
Author(s):  
Chi K. Chang ◽  
Lam-Lung Yeung ◽  
Tat-Shing Lai ◽  
Kim-Ho Ng ◽  
Hai-Yang Liu
Keyword(s):  
Manganese Porphyrin ◽  
Catalytic Epoxidation

Catalytic epoxidation of cis-stilbene and naphthalene by tetra-n-butylammonium hydrogen monopersulfate in the presence of manganese(III) tetraarylporphyrins and various anionic co-catalysts

2012 ◽  
Vol 16 (01) ◽  
pp. 149-153 ◽  
Author(s):  
Zahra Solati ◽  
Majid Hashemi ◽  
Ahmad Keshavarzi ◽  
Ezzat Rafiee
Keyword(s):  
High Yield ◽  
Manganese Porphyrin ◽  
Co Catalysts ◽  
Catalytic Epoxidation ◽  
Epoxidation Reaction

The epoxidation of cis-stilbene by n-Bu4NHSO5 was studied in the presence of two different manganese porphyrin complexes, [MnTPFPP(Cl) and MnTPP(Cl)], and various n-Bu4NX (X = OAc, F, Cl, Br, OCN, NO3, BF4). In general direct correlation was found between stereoselectivity of the epoxidation reaction and the nucleophilic properties of these anionic co-catalysts. Also epoxidation of naphthalene was carried out in high yield and good selectivity by n-Bu4NHSO5 in the presence of MnTPFPP(Cl) in association with n-Bu4NOAc or n-Bu4NF co-catalysts.

A manganese porphyrin–α-cyclodextrin conjugate as an artificial enzyme for the catalytic epoxidation of polybutadiene

2018 ◽  
Vol 54 (44) ◽  
pp. 5586-5589 ◽  
Author(s):  
Qi-Wei Zhang ◽  
Johannes A. A. W. Elemans ◽  
Paul B. White ◽  
Roeland J. M. Nolte
Keyword(s):  
Artificial Enzyme ◽  
Manganese Porphyrin ◽  
Catalytic Epoxidation

A manganese porphyrin–α-cyclodextrin conjugate was designed as an artificial clamp-like enzyme to catalyze the epoxidation of cis-polybutadiene with trans-epoxide preference.

Comparative 1HNMR and UV-Visible Studies of Polyene Polymer Epoxidations Catalyzed by Iron(III), Manganese(III) and Chromium(III) Porphyrins

1998 ◽  
Vol 02 (01) ◽  
pp. 53-60 ◽  
Author(s):  
E. M. DAVORAS ◽  
R. DIAPER ◽  
A. DERVISSI ◽  
M. J. TORNARITIS ◽  
A. G. COUTSOLELOS
Keyword(s):  
Catalytic Activity ◽  
Catalytic Reaction ◽  
Manganese Porphyrin ◽  
Visible Spectroscopy ◽  
Two Phase ◽  
H Nmr ◽  
Catalytic Epoxidation ◽  
Uv Visible ◽  
Phase Systems

The catalytic epoxidation of cis-polybutadiene was studied in two-phase systems, CH 2 CI 2/ H 2 O and PhIO (solid)/ CH 2 Cl 2, using chlorochromium(III), chloromanganese(III) and chloroiron(III) tetraphenylporphyrin complexes as catalysts. Comparison of the catalytic activity of these three catalysts showed that the manganese porphyrin is the most suitable catalyst for this reaction. The results are based on reaction product ratios as determined by 1 H NMR . UV-Visible spectroscopy allowed monitoring of the metalloporphyrin evolution during the catalytic reaction.

Catalytic epoxidation of cyclohexene by covalently linked manganese porphyrin–viologen complex

1998 ◽  
Vol 130 (3) ◽  
pp. 285-295 ◽  
Author(s):  
Yoshihiro Tsuda ◽  
Kohshin Takahashi ◽  
Takahiro Yamaguchi ◽  
Syuichi Matsui ◽  
Teruhisa Komura
Keyword(s):  
Manganese Porphyrin ◽  
Catalytic Epoxidation ◽  
Covalently Linked ◽  
Epoxidation Of Cyclohexene

ChemInform Abstract: Effect of Fifth Coordination in Catalytic Epoxidation by a Chiral Manganese Porphyrin.

ChemInform ◽  
2010 ◽  
Vol 33 (52) ◽  
pp. no-no
Author(s):  
Tat-Shing Lai ◽  
Kim-Ho Ng ◽  
Hai-Yang Liu ◽  
Chi K. Chang ◽  
Lam-Lung Yeung
Keyword(s):  
Manganese Porphyrin ◽  
Catalytic Epoxidation

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.

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