ChemInform Abstract: The Formation of Dibenzodioxocin Structures by Oxidative Coupling. A Model Reaction for Lignin Biosynthesis.

ChemInform ◽  
2010 ◽  
Vol 26 (40) ◽  
pp. no-no
Author(s):  
P. KARHUNEN ◽  
P. RUMMAKKO ◽  
J. SIPILAE ◽  
G. BRUNOV ◽  
I. KILPELAEINEN
Keyword(s):  
Oxidative Coupling ◽  
Lignin Biosynthesis ◽  
Model Reaction

The formation of dibenzodioxocin structures by oxidative coupling. A model reaction for lignin biosynthesis

1995 ◽  
Vol 36 (25) ◽  
pp. 4501-4504 ◽  
Author(s):  
Pirkko Karhunen ◽  
Petteri Rummakko ◽  
Jussi Sipilä ◽  
Gösta Brunow ◽  
Ilkka Kilpeläinen
Keyword(s):  
Oxidative Coupling ◽  
Lignin Biosynthesis ◽  
Model Reaction

Insights into the Extraction of Photogenerated Holes from CdSe/CdS Nanorods for Oxidative Organic Catalysis

2021 ◽  
Author(s):  
Yuchen Sha ◽  
Xiao-Min Lin ◽  
Jens Niklas ◽  
Oleg Poluektov ◽  
Benjamin T Diroll ◽  
...  
Keyword(s):  
Oxidative Coupling ◽  
Model Reaction ◽  
Core Shell ◽  
Organic Media ◽  
Cds Nanorods ◽  
Organic Catalysis

Using aerobic oxidative coupling of thiolphenol in organic media as a model reaction, we show that photogenerated holes in CdSe/CdS core-shell nanorods can be efficiently exctracted. As a result, CdSe/CdS...

Doped Polymers by Oxidative Polymerization. 4.†Oxidative Coupling of Methylated Oligothiophenes by FeCl3·6H2O as a Model Reaction for the Oxidative Polymerization of Thiophene Derivatives

1996 ◽  
Vol 29 (10) ◽  
pp. 3370-3375 ◽  
Author(s):  
Gunnar Engelmann ◽  
Werner Jugelt ◽  
Gerhard Kossmehl ◽  
Hans-Peter Welzel ◽  
Peter Tschuncky ◽  
...  
Keyword(s):  
Oxidative Coupling ◽  
Oxidative Polymerization ◽  
Model Reaction ◽  
Doped Polymers ◽  
Thiophene Derivatives

An Unprecedented Cyano-Induced Sodium Nitrite-Catalyzed C(sp3)-H and C(sp2)-H Coupling Reaction

2018 ◽  
Vol 15 (7) ◽  
pp. 989-994 ◽  
Author(s):  
Ling Li ◽  
Bo Su ◽  
Yuxiu Liu ◽  
Qingmin Wang
Keyword(s):  
Sodium Nitrite ◽  
Oxidative Coupling ◽  
High Resolution Mass Spectrometry ◽  
Coupling Reaction ◽  
13C Nmr Spectroscopy ◽  
Coupling Reactions ◽  
Reaction Conditions ◽  
1H And 13C Nmr ◽  
Oxidative Coupling Reaction ◽  
Oxidative Coupling Reactions

Aim and Objective: During the investigation of sodium nitrite-catalyzed oxidative coupling reaction of aryls, an unprecedented C(sp2)-H and C(sp3)-H coupling of substituted 2-aryl acetonitrile was found. Materials and Methods: The structure of the coupled product was confirmed by 1H and 13C NMR spectroscopy and high-resolution mass spectrometry (HRMS), and comparison of its derivatives with known compounds. The effects of methoxy group in the benzene ring on the reaction were evaluated. Results: The optimized reaction conditions are summarized as follows: CF3SO3H/substrate = 1.5 equiv., NaNO2/substrate = 0.3 equiv., CH3CN as solvent. 2-(4-Methoxyphenyl)acetonitrile and 2-(3,4,5- trimethoxyphenyl)acetonitrile could also generate C(sp2)-H and C(sp3)-H coupling. The coupling reaction occurred as a typical radial mechanism. Conclusion: An unprecedented cyano-induced, NaNO2-catalyzed oxidative C(sp3)-H and C(sp2)-H coupling was reported. The reaction proceeded under very mild conditions, using O2 in the air as terminal oxidant. The unique oxidative manner might provide more inspiration for the development of intriguing oxidative coupling reactions.

The Effect of γ-Al2O3, TiO2 and ZrO2 Supports on Hydrodesulfurization Activity of Transition-Metal Sulfides

2008 ◽  
Vol 73 (8-9) ◽  
pp. 945-955 ◽  
Author(s):  
Luděk Kaluža ◽  
Miroslav Zdražil
Keyword(s):  
Transition Metal ◽  
Aqueous Solutions ◽  
Model Reaction ◽  
Metal Sulfides ◽  
Vacuum Impregnation ◽  
Transition Metal Sulfides ◽  
Highly Active ◽  
System A ◽  
Benzothiophene Hydrodesulfurization ◽  
Hydrodesulfurization Activity

The transition metals V, Cr, Mn, Fe, Co, Ni, Mo, Ru, Rh, Pd, W, Re, Os, Ir and Pt were deposited from aqueous solutions of their salts onto conventional γ-Al2O3 and unconventional TiO2 and ZrO2 supports by vacuum impregnation and characterized in their sulfided form by a model reaction of benzothiophene hydrodesulfurization. It was found that the TiO2 and ZrO2 supports influenced predominantly positively the resulting activity of relatively low-active metals (V, Cr, Mn, Fe, Co, Ni, Mo, Ru, W and Os), whereas the highly active metals (Rh, Pd, Ir, Pt and Re) were influenced slightly negatively or not at all by those supports compared with the γ-Al2O3-supported system. A significant effect of the supports on the hydrodesulfurization-activity ranking of the transition-metal sulfides studied was ascertained.

Synthesis of N4-Substituted Derivatives of 1-[2-(Phosphonomethoxy)ethyl]cytosine and Its Diisopropyl Ester as a Model Reaction for the Synthesis of N4-Substituted Derivatives of Cidofovir

2005 ◽  
Vol 70 (12) ◽  
pp. 2066-2074 ◽  
Author(s):  
Šárka Chalupová ◽  
Antonín Holý ◽  
Milena Masojídková
Keyword(s):  
Secondary Amine ◽  
Model Reaction ◽  
Aqueous Methanol ◽  
Derivatives Of ◽  
Amine Salts

We have studied the reaction of 1-[2-(phosphonomethoxy)ethyl]cytosine (1) and its diisopropyl ester (2) with triethylammonium hydrogensulfite in 60% aqueous methanol. In the presence of some primary or secondary amine salts, at 25-70 °C, this reaction affords transaminated derivatives 4a-4e and 5a, 5b as main products accompanied by uracil compounds. However, with certain amines the reaction failed.

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