The first vanadium-catalyzed oxidation of aryl allylic selenides with in situ [2,3] sigmatropic rearrangement

2000 ◽  
pp. 2031-2032 ◽  
Author(s):  
Rich G. Carter ◽  
T. Campbell Bourland
Keyword(s):  
Sigmatropic Rearrangement ◽  
Catalyzed Oxidation

scholarly journals Application of an enzymatic cascade reaction for the synthesis of the emeraldine salt form of polyaniline

2021 ◽  
Author(s):  
Minoru Kurisu ◽  
Reinhard Kissner ◽  
Masayuki Imai ◽  
Peter Walde
Keyword(s):  
Cascade Reaction ◽  
Emeraldine Salt ◽  
Salt Form ◽  
Experimental Conditions ◽  
Peroxidase Isoenzyme ◽  
Large Unilamellar Vesicles ◽  
Dark Green ◽  
Catalyzed Oxidation ◽  
Reference Reaction

AbstractThe synthesis of the emeraldine salt form of polyaniline (PANI-ES) from aniline with Aspergillus sp. glucose oxidase (GOD), d-glucose, dissolved O2, and horseradish peroxidase isoenzyme C (HRPC) in the presence of large unilamellar vesicles of AOT (sodium bis-(2-ethylhexyl)sulfosuccinate) as templates at pH = 4.3 and T ~ 25 °C was investigated in a systematic way. In this cascade reaction mixture, the oxidation of aniline is catalyzed by HRPC with H2O2 that is formed in situ as byproduct of the GOD-catalyzed oxidation of d-glucose with O2. Under the elaborated experimental conditions which we considered ideal, the formation of PANI-ES products is evident, as judged by UV/Vis/NIR and EPR measurements. Comparison was made with a reference reaction, which was run under similar conditions with added H2O2 instead of GOD and d-glucose. Although the reference reaction was found to be superior, with the cascade reaction, PANI-ES products can still be obtained with high aniline conversion (> 90%) within 24 h as stable dark green PANI-ES/AOT vesicle dispersion. Our results show that the in situ formation of H2O2 does not prevent the inactivation of HRPC known to occur in the reference reaction. Moreover, the GOD used in the cascade reaction is inactivated as well by polymerization intermediates.

scholarly journals Vanadium-catalyzed selenide oxidation with in situ [2,3] sigmatropic rearrangement (SOS reaction): scope and asymmetric applications

2004 ◽  
Vol 2 (9) ◽  
pp. 1315-1329 ◽  
Author(s):  
T. Campbell Bourland ◽  
Rich G. Carter ◽  
Alexandre F. T. Yokochi
Keyword(s):  
Sigmatropic Rearrangement

scholarly journals Mechanistic insights into the selective oxidation of 5-(hydroxymethyl)furfural over silver-based catalysts

2020 ◽  
Vol 10 (15) ◽  
pp. 5036-5047 ◽  
Author(s):  
Oliver R. Schade ◽  
Abhijeet Gaur ◽  
Anna Zimina ◽  
Erisa Saraçi ◽  
Jan-Dierk Grunwaldt
Keyword(s):  
Selective Oxidation ◽  
Absorption Spectroscopy ◽  
Reaction Conditions ◽  
X Ray ◽  
Hydroxymethyl Furfural ◽  
X Ray Absorption ◽  
Catalyzed Oxidation

Silver-catalyzed oxidation of 5-(hydroxymethyl)furfural (HMF) to 5-hydroxymethyl-2-furancarboxylic acid (HFCA) was investigated using in situ X-ray absorption spectroscopy under reaction conditions over Ag/ZrO2 and Ag/TiO2 catalysts.

scholarly journals Synthesis of oxa-bridged derivatives from Diels–Alder bis-adducts of butadiene and 1,2,3,4-tetrahalo-5,5-dimethoxycyclopentadiene

2010 ◽  
Vol 6 ◽  
Author(s):  
Faiz Ahmed Khan ◽  
Karuppasamy Parasuraman
Keyword(s):  
Diels Alder ◽  
One Pot ◽  
Excellent Yield ◽  
Catalyzed Oxidation

Bis-adducts of 1,2,3,4-tetrahalo-5,5-dimethoxycyclopentadiene and 1,3-butadiene, generated in situ from 3-sulfolene, have been synthesized in excellent yield. Ruthenium catalyzed oxidation of the bis-adducts followed by a one-pot transformation of the resulting α-diketone furnished oxa-bridged compounds. Unambiguous stereochemical assignments of both diastereomeric series are reported.

PdAu-catalyzed oxidation through in situ generated H2O2 in simulated produced water

2020 ◽  
Vol 339 ◽  
pp. 362-370 ◽  
Author(s):  
Yiyuan B. Yin ◽  
Kimberly N. Heck ◽  
Christian L. Coonrod ◽  
Camilah D. Powell ◽  
Sujin Guo ◽  
...  
Keyword(s):  
Produced Water ◽  
Catalyzed Oxidation
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