Atom-economical selenation of electron-rich arenes and phosphonates with molecular oxygen at room temperature

2018 ◽  
Vol 16 (47) ◽  
pp. 9243-9250 ◽  
Author(s):  
Samir Kumar Bhunia ◽  
Pritha Das ◽  
Ranjan Jana
Keyword(s):  
Molecular Oxygen ◽  
Room Temperature ◽  
Environmentally Benign

An environmentally benign selenation of electron-rich arenes and phosphonates is developed adopting a novel recycle–reuse–reduce strategy for selenol by oxygen.

Visible light-induced aerobic oxidation of diarylalkynes to α-diketones catalyzed by copper-superoxo at room temperature

2020 ◽  
Vol 22 (14) ◽  
pp. 4426-4432 ◽  
Author(s):  
Vaibhav Pramod Charpe ◽  
Arunachalam Sagadevan ◽  
Kuo Chu Hwang
Keyword(s):  
Visible Light ◽  
Molecular Oxygen ◽  
Visible Light Irradiation ◽  
Room Temperature ◽  
Aerobic Oxidation ◽  
Low Energy ◽  
Light Irradiation ◽  
Environmentally Benign ◽  
Chloride Salt ◽  
Feasible Method

We demonstrate an environmentally benign and economically feasible method for the oxidation of stable diarylalkynes to diketones at room temperature using the inexpensive copper(ii) chloride salt and molecular oxygen under low energy visible light irradiation.

Naturally Occurring Organic Acid-catalyzed Facile Diastereoselective Synthesis of Biologically Active (E)-3-(arylimino)indolin-2-one Derivatives in Water at Room Temperature

2019 ◽  
Vol 23 (16) ◽  
pp. 1778-1788 ◽  
Author(s):  
Gurpreet Kaur ◽  
Arvind Singh ◽  
Kiran Bala ◽  
Mamta Devi ◽  
Anjana Kumari ◽  
...  
Keyword(s):  
Room Temperature ◽  
Biologically Active ◽  
Environmentally Benign ◽  
Diastereoselective Synthesis ◽  
Substituted Anilines ◽  
Reaction Conditions ◽  
Naturally Occurring ◽  
Acid Catalyzed ◽  
Reaction Media ◽  
Column Chromatographic

A simple, straightforward and efficient method has been developed for the synthesis of (E)-3-(arylimino)indolin-2-one derivatives and (E)-2-((4-methoxyphenyl)imino)- acenaphthylen-1(2H)-one. The synthesis of these biologically-significant scaffolds was achieved from the reactions of various substituted anilines and isatins or acenaphthaquinone, respectively, using commercially available, environmentally benign and naturally occurring organic acids such as mandelic acid or itaconic acid as catalyst in aqueous medium at room temperature. Mild reaction conditions, energy efficiency, good to excellent yields, environmentally benign conditions, easy isolation of products, no need of column chromatographic separation and the reusability of reaction media are some of the significant features of the present protocol.

Rapid high conversion of high free fatty acid feedstock into biodiesel using continuous flow vortex fluidics

RSC Advances ◽  
2015 ◽  
Vol 5 (3) ◽  
pp. 2276-2280 ◽  
Author(s):  
Joshua Britton ◽  
Colin L. Raston
Keyword(s):  
Fatty Acids ◽  
Free Fatty Acids ◽  
Continuous Flow ◽  
Room Temperature ◽  
Flow Chemistry ◽  
Environmentally Benign ◽  
High Free Fatty Acid ◽  
Rapid Reduction ◽  
Biodiesel Feedstock ◽  
Flow Vortex

Rapid reduction of free fatty acids in biodiesel feedstock: the rapid conversion of problematic free fatty acids in bio-oils has been achieved using room temperature, environmentally benign vortex fluidic flow chemistry.

scholarly journals Synthesis of Some 2-Amino-5-substituted-1,3,4-oxadiazole Derivatives in the Acetic Acid

2011 ◽  
Vol 8 (s1) ◽  
pp. S448-S454 ◽  
Author(s):  
Sanjeev Kumar
Keyword(s):  
Acetic Acid ◽  
Room Temperature ◽  
Platinum Electrode ◽  
Supporting Electrolyte ◽  
Saturated Calomel Electrode ◽  
Reference Electrode ◽  
Lithium Perchlorate ◽  
Environmentally Benign ◽  
Controlled Potential ◽  
Oxadiazole Derivatives

An environmentally benign method for the preparation of 2-amino-5-substituted-1,3,4-oxadiazoles (1a-n) at platinum electrode through the electrooxidation of semicarbazone at room temperature is reported. The electrolysis were carried out at controlled potential in acetic acid solvent using lithium perchlorate as supporting electrolyte in an undivided cell assembly. Square shaped plates of platinum were used for working as well as counter electrode and a third electrode saturated calomel electrode was used as a reference electrode for the measurement of potential difference between two electrodes during the electrolysis.

Copper-Catalyzed Tandem Multi-Component Approach to 1,3-Oxazines at Room Temperature by Cross-Dehydrogenative Coupling Using Methanol as C1 Feedstock

Synlett ◽  
2018 ◽  
Vol 29 (09) ◽  
pp. 1171-1175 ◽  
Author(s):  
Paran Borpatra ◽  
Mohit Deb ◽  
Pranjal Baruah
Keyword(s):  
Carbon Source ◽  
Room Temperature ◽  
Inert Atmosphere ◽  
Environmentally Benign ◽  
Metal Catalyst ◽  
Methylene Carbon ◽  
One Pot ◽  
Dehydrogenative Coupling ◽  
Tert Butyl Hydroperoxide ◽  
Component Approach

A copper(II)-catalyzed multi-component one-pot approach for the synthesis of 1,3-oxazines at room temperature is reported here. Methanol is used as the solvent as well as the carbon source. The methylene carbon of the oxazine product comes from methanol via formaldehyde. tert-Butyl hydroperoxide is used as the oxidant. The reaction uses an environmentally benign metal catalyst and oxidant. No inert atmosphere or precaution is required for the reaction. Most importantly, the reaction avoids the use of carcinogenic formaldehyde.

scholarly journals Visible-light-mediated Minisci C–H alkylation of heteroarenes with unactivated alkyl halides using O2 as an oxidant

2019 ◽  
Vol 10 (4) ◽  
pp. 976-982 ◽  
Author(s):  
Jianyang Dong ◽  
Xueli Lyu ◽  
Zhen Wang ◽  
Xiaochen Wang ◽  
Hongjian Song ◽  
...  
Keyword(s):  
Visible Light ◽  
Molecular Oxygen ◽  
Room Temperature ◽  
Alkyl Halides

Herein, we report a protocol for direct visible-light-mediated Minisci C–H alkylation of heteroarenes with unactivated alkyl halides using molecular oxygen as an oxidant at room temperature.

Visible light-promoted copper catalyzed regioselective acetamidation of terminal alkynes by arylamines

2020 ◽  
Vol 22 (4) ◽  
pp. 1164-1170 ◽  
Author(s):  
V. Kishore Kumar Pampana ◽  
Arunachalam Sagadevan ◽  
Ayyakkannu Ragupathi ◽  
Kuo Chu Hwang
Keyword(s):  
Visible Light ◽  
Molecular Oxygen ◽  
Visible Light Irradiation ◽  
Room Temperature ◽  
Light Irradiation ◽  
Terminal Alkynes

Herein, we describe a copper photoredox catalyzed synthesis of acetamide via regioselective C–N coupling of arylamines with terminal alkynes using molecular oxygen (O2) as an oxidant at room temperature under visible light irradiation (47 examples).

scholarly journals Unmodified kraft lignin isolated at room temperature from aqueous solution for preparation of highly flexible transparent polyurethane coatings

RSC Advances ◽  
2018 ◽  
Vol 8 (71) ◽  
pp. 40765-40777 ◽  
Author(s):  
Stephanie Elisabeth Klein ◽  
Jessica Rumpf ◽  
Peter Kusch ◽  
Rolf Albach ◽  
Matthias Rehahn ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Room Temperature ◽  
Kraft Lignin ◽  
Environmentally Benign ◽  
Polyurethane Coatings

Polyurethane (PU) coatings were successfully produced using unmodified kraft lignin (KL) as an environmentally benign component in contents of up to 80 wt%.

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