scholarly journals Highly Efficient and Ambient-Temperature Synthesis of Benzimidazoles via Co(III)/Co(II)-Mediated Redox Catalysis

Catalysts ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 59
Author(s):  
Renyuan Zhong ◽  
Wulin Xiong ◽  
Haoyuan Zhang ◽  
Tongtong Zeng ◽  
Shanshan Gong ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Ambient Temperature ◽  
Efficient Method ◽  
Solvent Free ◽  
Redox Catalysis ◽  
Temperature Synthesis ◽  
Fast Green ◽  
Stoichiometric Amount ◽  
Highly Efficient ◽  
Solvent Free Conditions

An efficient method for ambient-temperature synthesis of a variety of 2-substituted and 1,2-disubstituted benzimidazoles from aldehyde and phenylenediamine substrates has been developed by utilizing Co(III)/Co(II)-mediated redox catalysis. The combination of only 1 mol% of Co(acac)2 and stoichiometric amount of hydrogen peroxide provides a fast, green, and mild access to a diversity of benzimidazoles under solvent-free conditions.

scholarly journals Highly Efficient Selective Oxygenation of Sulfides to Sulfoxides by Oxalic Acid Dihydrate in the Presence of H2O2

2012 ◽  
Vol 9 (2) ◽  
pp. 863-868 ◽  
Author(s):  
Masoud Mokhtary ◽  
Mohammad Qandalee ◽  
Masoumeh Rastegar Niaki
Keyword(s):  
Hydrogen Peroxide ◽  
Oxalic Acid ◽  
Ambient Temperature ◽  
Efficient Method ◽  
Oxalic Acid Dihydrate ◽  
Oxidation Of Sulfides ◽  
Highly Efficient

A highly efficient method for the oxidation of sulfides to sulfoxides using oxalic acid dihydrate in the presence of hydrogen peroxide has been developed. A versatile procedure for the oxidation of sulfides to sulfoxides without any over-oxidation to sulfones has been reported. This procedure cleanly oxidizes sulfides to the corresponding sulfoxides in excellent yields at ambient temperature.

scholarly journals Solvent-free and room temperature synthesis of 3-arylquinolines from different anilines and styrene oxide in the presence of Al2O3/MeSO3H

2017 ◽  
Vol 13 ◽  
pp. 1977-1981 ◽  
Author(s):  
Hashem Sharghi ◽  
Mahdi Aberi ◽  
Mohsen Khataminejad ◽  
Pezhman Shiri
Keyword(s):  
Room Temperature ◽  
Styrene Oxide ◽  
Environmentally Friendly ◽  
Solvent Free ◽  
Temperature Synthesis ◽  
One Pot ◽  
Room Temperature Synthesis ◽  
Highly Efficient ◽  
Rapid Access ◽  
Solvent Free Conditions

A highly efficient, simple and environmentally friendly synthesis of 3-arylquinolines has been developed in the presence of Al2O3/MeSO3H via one-pot reaction of anilines and styrene oxide. This methodology provides very rapid access to 3-arylquinolines in good to excellent yields under solvent-free conditions at room temperature in air.

Nano zirconia catalysed one-pot synthesis of some novel substituted imidazoles under solvent-free conditions

RSC Advances ◽  
2015 ◽  
Vol 5 (36) ◽  
pp. 28163-28170 ◽  
Author(s):  
Shivam Bajpai ◽  
Sundaram Singh ◽  
Vandana Srivastava
Keyword(s):  
Multicomponent Reaction ◽  
Efficient Method ◽  
Ammonium Acetate ◽  
Aromatic Aldehydes ◽  
Solvent Free ◽  
One Pot ◽  
Highly Efficient ◽  
One Pot Synthesis ◽  
Solvent Free Conditions ◽  
Isatin Derivatives

A highly efficient method for the synthesis of substituted imidazoles from a multicomponent reaction of isatin derivatives with ammonium acetate and aromatic aldehydes under solvent-free conditions has been established.

Al(OTf)3 — A highly efficient catalyst for the tetrahydropyranylation of alcohols under solvent-free conditions

2008 ◽  
Vol 86 (12) ◽  
pp. 1099-1104 ◽  
Author(s):  
Ahmed Kamal ◽  
M Naseer A Khan ◽  
Y VV Srikanth ◽  
K Srinivasa Reddy
Keyword(s):  
Comparative Study ◽  
Efficient Method ◽  
Catalytic Amount ◽  
Solvent Free ◽  
Molar Ratio ◽  
Reaction Conditions ◽  
Efficient Catalyst ◽  
Highly Efficient ◽  
Solvent Free Conditions ◽  
The Comparative Study

A simple and highly efficient method has been developed for the tetrahydropyranylation of alcohols by their reaction with 3,4-dihydro-2H-pyran (DHP) using a catalytic amount (0.01–1 mol%) of aluminium triflate under solvent-free conditions. The effect of various factors like temperature, amount of the catalyst, and molar ratio of substrates on the reaction conditions has also been studied. The comparative study of tetrahydropyranylation of benzyl alcohol using various catalysts including some reported ones shows the efficiency of this catalyst.Key words: tetrahydropyranylation, aluminium triflate, alcohols, catalysis.

A highly efficient and green approach for the synthesis of pyrimido[4,5-b]quinolines using N,N-diethyl-N-sulfoethanaminium chloride

2021 ◽  
Vol 76 (2) ◽  
pp. 85-90
Author(s):  
Abdolkarim Zare ◽  
Manije Dianat
Keyword(s):  
Reaction Times ◽  
Solvent Free ◽  
One Pot ◽  
Catalyst Amount ◽  
Green Protocol ◽  
Highly Efficient ◽  
Green Approach ◽  
Solvent Free Conditions ◽  
The One ◽  
High Yields

Abstract A highly efficient and green protocol for the synthesis of pyrimido[4,5-b]quinolines has been described. The one-pot multicomponent reaction of dimedone with arylaldehydes and 6-amino-1,3-dimethyluracil in the presence of N,N-diethyl-N-sulfoethanaminium chloride ([Et3N–SO3H][Cl]) as an ionic liquid (IL) catalyst under solvent-free conditions afforded the mentioned compounds in high yields and short reaction times. Our protocol is superior to many of the reported protocols in terms of two or more of these factors: the reaction times, yields, conditions (solvent-free versus usage of organic solvents), temperature and catalyst amount.

scholarly journals Solvent-free synthesis of symmetric methylene diesters via direct reaction of aromatic carboxylates with 1,n-dihaloalkanes

RSC Advances ◽  
2021 ◽  
Vol 11 (46) ◽  
pp. 28711-28715
Author(s):  
Lin Bai ◽  
Shenglong Ding ◽  
Xiaofang Ma
Keyword(s):  
Solvent Free ◽  
Direct Reaction ◽  
Highly Efficient ◽  
Solvent Free Conditions ◽  
Aromatic Carboxylates ◽  
Solvent Free Synthesis

This work provides a highly efficient and feasible strategy for the synthesis of symmetric methylene diesters, involving the direct diesterification of various carboxylates with 1,n-dihaloalkanes under solvent-free conditions.

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