H2O2 in WEB: a highly efficient catalyst system for the Dakin reaction

2015 ◽  
Vol 17 (9) ◽  
pp. 4533-4536 ◽  
Author(s):  
Bishwajit Saikia ◽  
Parinita Borah ◽  
Nabin Chandra Barua
Keyword(s):  
Transition Metal ◽  
Organic Solvent ◽  
Room Temperature ◽  
Reaction Times ◽  
Water Extract ◽  
Catalyst System ◽  
Metal Catalyst ◽  
Efficient Catalyst ◽  
Transition Metal Catalyst ◽  
Neat Water

Without using any transition metal catalyst, ligand, base, toxic or hazardous reagent, additives/promoters and organic solvent, Dakin reactions have been successfully carried out by using H2O2 in neat ‘Water Extract of Banana’ (WEB) at room temperature under aerobic conditions in very short reaction times.

[bmim]PF6/KOH: A Recyclable Catalytic System for an Azide–Arylacetaldehyde [3 + 2] Cycloaddition

2017 ◽  
Vol 41 (11) ◽  
pp. 631-635
Author(s):  
Yuqin Jiang ◽  
Kai Wu ◽  
Xuxia Tan ◽  
Dandan Zhang ◽  
Wenpei Dong ◽  
...  
Keyword(s):  
Transition Metal ◽  
Organic Solvent ◽  
Catalytic System ◽  
Room Temperature ◽  
Reaction Medium ◽  
Metal Catalyst ◽  
Transition Metal Catalyst ◽  
Green Protocol ◽  
Mild Conditions

A fast and green protocol for the synthesis of 1,4-disubstituted 1,2,3-triazoles from azides and arylacetaldehydes at room temperature was developed using [bmim]PF6/KOH as the reaction medium. It was found that the in situ-generated carbene from [bmim]PF6/KOH acted as the catalyst. In the absence of a transition-metal catalyst and organic solvent, this azide–arylacetaldehyde [3 + 2] cycloaddition proceeds efficiently, with high levels of regioselectivity, broad range of substrates, excellent yields and simple operation under mild conditions.

A new avenue to the Dakin reaction in H2O2–WERSA

RSC Advances ◽  
2015 ◽  
Vol 5 (128) ◽  
pp. 105583-105586 ◽  
Author(s):  
Bishwajit Saikia ◽  
Parinita Borah
Keyword(s):  
Transition Metal ◽  
Organic Solvent ◽  
Room Temperature ◽  
Metal Catalyst ◽  
Transition Metal Catalyst ◽  
Base Organic Solvent

We have developed a novel protocol to realize the Dakin reaction in H2O2–WERSA at room temperature and the system does not require activation, toxic ligand, additive/promoter, transition metal catalyst, base, organic solvent and so on.

Transition Metal Catalyst, Solvent, Base Free Synthesis of Diaryl Diselenides under Mechanical Ball Milling

2021 ◽  
Vol 19 ◽  
Author(s):  
Debasish Kundu ◽  
Anup Roy ◽  
Subir Panja
Keyword(s):  
Transition Metal ◽  
Ball Milling ◽  
Room Temperature ◽  
General Procedure ◽  
Cross Coupling ◽  
High Yield ◽  
Metal Catalyst ◽  
Transition Metal Catalyst ◽  
Wide Range ◽  
Mechanical Ball Milling

Abstract: A convenient, efficient, and general procedure for the synthesis of diaryl diselenides has been developed by the reaction of aryl diazonium tetrafluoroborates and Potassium Selenocyanate on the surface of alumina under ball-milling in absence of any solvent, transition metal catalyst and base in room temperature. A wide range of functionalized diaryl diselenides are obtained in high purity and high yield by this procedure. Background: Synthesis of diaryl diselenides was restricted into only few Cu-catalyzed C-Se Cross coupling protocol where use of ligands, high reaction temp, long reaction time were required Objective: To achieve a sustainable protocol for the synthesis of diaryl diselenides Method: Reaction of aryl diazonium fluoroborate with KSeCN was successfully performed under ball milling in absence of any ransition metal catalyst, ligands, base and external heating to get diaryl diselenides. Results: A library of diaryl diselenides were obtained in good yields with different functional groups. Conclusion: First transition metal free protocol for the synthesis of diaryl diselenides has been developed successfully.

Accelerated Ambient-Temperature ATRP of Methyl Acrylate in Alcohol-Water Solutions with a Mixed Transition-Metal Catalyst System

2012 ◽  
Vol 213 (16) ◽  
pp. 1677-1687 ◽  
Author(s):  
Carlos M. R. Abreu ◽  
Patrícia V. Mendonça ◽  
Arménio C. Serra ◽  
Jorge F. J. Coelho ◽  
Anatoliy V. Popov ◽  
...  
Keyword(s):  
Transition Metal ◽  
Ambient Temperature ◽  
Methyl Acrylate ◽  
Catalyst System ◽  
Metal Catalyst ◽  
Transition Metal Catalyst ◽  
Water Solutions ◽  
Alcohol Water ◽  
Mixed Transition

Progress in propylene homo- and copolymers using advance transition metal catalyst system

2021 ◽  
Author(s):  
Anurag Mishra ◽  
Harshad R. Patil ◽  
VirendraKumar Kumar Gupta
Keyword(s):  
Transition Metal ◽  
Catalyst System ◽  
Metal Catalysts ◽  
Transition Metal Catalysts ◽  
Propylene Polymerization ◽  
Metal Catalyst ◽  
Transition Metal Catalyst ◽  
Catalyst Development ◽  
System P ◽  
Homogeneous Media

The transition metal catalysts have evolved dynamically in last few years for propylene polymerization and copolymerization in homogeneous media. The trends in catalyst development have moved from modification of Group...

Direct arylation of pyridines without the use of a transition metal catalyst

2014 ◽  
Vol 50 (54) ◽  
pp. 7124-7127 ◽  
Author(s):  
Yahui Li ◽  
Wei Liu ◽  
Chunxiang Kuang
Keyword(s):  
Transition Metal ◽  
Room Temperature ◽  
Metal Catalyst ◽  
Transition Metal Catalyst ◽  
Direct Arylation ◽  
Reaction Proceeds

This new reaction proceeds readily at room temperature without the use of any transition metal catalyst.

Progress in Development of Catalyst Systems for Coordinated Polymerization of Olefins

2014 ◽  
Vol 900 ◽  
pp. 11-14 ◽  
Author(s):  
Wei Zhou ◽  
Lei Zhong ◽  
Wei Dong Li
Keyword(s):  
Transition Metal ◽  
Olefin Polymerization ◽  
Catalyst System ◽  
Metal Catalyst ◽  
Metallocene Catalysts ◽  
Catalytic Polymerization ◽  
Transition Metal Catalyst ◽  
Polymerization Catalyst ◽  
Catalyst Systems ◽  
Ziegler Natta Catalysts

The research progresses about polyolefin catalyst systems in recent years are summarized. Focusing on the type and properties of the catalytic polymerization of the olefin polymerization catalyst, including typical Ziegler-Natta catalysts, metallocene catalysts and post-transition metal catalyst system. Then the new post-transition metal catalyst is introduced.

Preparation and Characterization of a Novel Room Temperature Dicationic Ionic Liquid and its Application in the Synthesis of Xanthenediones Under Solvent-Free Conditions

2018 ◽  
Vol 21 (8) ◽  
pp. 602-608 ◽  
Author(s):  
Zainab Ehsani-Nasab ◽  
Ali Ezabadi
Keyword(s):  
Ionic Liquid ◽  
Room Temperature ◽  
Reaction Times ◽  
Significant Loss ◽  
Solvent Free ◽  
Acidity Function ◽  
Efficient Catalyst ◽  
Solvent Free Conditions ◽  
Hammett Acidity Function ◽  
Dicationic Ionic Liquid

Aim and Objective: In the present work, 1, 1’-sulfinyldiethylammonium bis (hydrogen sulfate) as a novel room temperature dicationic ionic liquid was synthesized and used as a catalyst for xanthenediones synthesis. Material and Method: The dicationic ionic liquid has been synthesized using ethylamine and thionyl chloride as precursors. Then, by the reaction of [(EtNH2)2SO]Cl2 with H2SO4, [(EtNH2)2SO][HSO4]2 was prepared and after that, it was characterized by FT-IR, 1H NMR, 13C NMR as well as Hammett acidity function. This dicationic ionic liquid was used as a catalyst for the synthesis of xanthenediones via condensation of structurally diverse aldehydes and dimedone under solvent-free conditions. The progress of the reaction was monitored by thin layer chromatography (ethyl acetate/n-hexane = 3/7). Results: An efficient solvent-free method for the synthesis of xanthenediones has been developed in the presence of [(EtNH2)2SO][HSO4]2 as a powerful catalyst with high to excellent yields, and short reaction times. Additionally, recycling studies have demonstrated that the dicationic ionic liquid can be readily recovered and reused at least four times without significant loss of its catalytic activity. Conclusion: This new dicationic ionic liquid can act as a highly efficient catalyst for xanthenediones synthesis under solvent-free conditions.

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