scholarly journals Application of beta zeolite in allylation reaction aiming formation of new C-C bonds

Cerâmica ◽  
2020 ◽  
Vol 66 (379) ◽  
pp. 243-249
Author(s):  
V. K. S. A. Macedo ◽  
C. S. Santos ◽  
M. I. S. de Mello ◽  
J. A. B. L. R. Alves ◽  
J. M. F. Barros ◽  
...  
Keyword(s):  
Green Chemistry ◽  
Room Temperature ◽  
Reaction Times ◽  
Environmentally Friendly ◽  
Zeolite Beta ◽  
Beta Zeolite ◽  
Reaction Cycle ◽  
Homoallylic Alcohols ◽  
Environmentally Friendly Method

Abstract This study describes the formation of new C-C bonds through the allylation reaction of different aldehydes promoted by beta zeolite. This environmentally friendly method was characterized by its efficiency, versatility, and chemoselectivity in the formation of different homoallylic alcohols. Homoallylic alcohols were obtained in good yields (80% to 96%), short reaction times (30 to 75 min) at room temperature, and without the need for additional purifications. In addition, water was used as a co-solvent, ensuring the method a development in the field of green chemistry. Moreover, it was found that the zeolite beta can be reused for up to one reaction cycle without loss of its efficiency.

scholarly journals Anthranilic acids from isatin: an efficient, versatile and environmentally friendly method

2015 ◽  
Vol 87 (3) ◽  
pp. 1525-1529 ◽  
Author(s):  
GABRIEL F. RIO ◽  
BÁRBARA V. SILVA ◽  
SABRINA T. MARTINEZ ◽  
ANGELO C. PINTO
Keyword(s):  
Reaction Time ◽  
Nitrogen Atom ◽  
Aromatic Ring ◽  
Room Temperature ◽  
Environmentally Friendly ◽  
Reaction Conditions ◽  
Anthranilic Acids ◽  
Environmentally Friendly Method

This paper describes the preparation of a series of 16 anthranilic acids in yields ranging from 51 to 97%, by treating the isatins with NaOH and H2O2. Independently of the nature of the substituent on the aromatic ring, the reactions were complete in 15 min at room temperature, whereas those of isatins containing a substituent on the nitrogen atom required longer reaction time for completion (45 min) under the same reaction conditions.

scholarly journals A Facile Synthesis of New 2-Amino-4H-pyran-3-carbonitriles by a One-Pot Reaction of -Bis(arylidene) Cycloalkanones and Malononitrile in the Presence of

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Zahed Karimi-Jaberi ◽  
Baharak Pooladian
Keyword(s):  
Reaction Times ◽  
Environmentally Friendly ◽  
Facile Synthesis ◽  
One Pot ◽  
One Pot Condensation ◽  
Environmentally Friendly Method

A rapid and environmentally friendly method is developed for the synthesis of a series of new substituted 2-amino-4H-pyran-3-carbonitriles through a one-pot condensation of malononitrile and -bis(arylidene) cycloalkanones in ethanol by using K2CO3as a catalyst. Short experimental reaction times, excellent yields, no need to use cumbersome apparatus for purification of the products, and inexpensiveness and commercially availability of the catalyst are the advantages of this method.

Iron or boron-catalyzed C–H arylthiation of substituted phenols at room temperature

2014 ◽  
Vol 50 (64) ◽  
pp. 8875-8877 ◽  
Author(s):  
Hua Tian ◽  
Changjin Zhu ◽  
Haijun Yang ◽  
Hua Fu
Keyword(s):  
Room Temperature ◽  
Environmentally Friendly ◽  
Substituted Phenols ◽  
Environmentally Friendly Method

A simple, efficient and environmentally friendly method for iron or boron-catalyzed C–H arylthiation of substituted phenols at room temperature has been developed, and the corresponding diaryl sulfides were prepared in good to excellent yields.

Study on a polyacrylate-based waterborne coating: facile preparation, convenient self-healing behavior and photoluminescence properties

2020 ◽  
Vol 8 (36) ◽  
pp. 12638-12647
Author(s):  
Bo Wu ◽  
Anqian Yuan ◽  
Yao Xiao ◽  
Yi Wang ◽  
Jingxin Lei
Keyword(s):  
Room Temperature ◽  
Environmentally Friendly ◽  
Waterborne Coating ◽  
Self Healing ◽  
Photoluminescence Properties ◽  
Facile Preparation ◽  
Environmentally Friendly Method

A facile and environmentally friendly method towards mechanically robust, highly transparent, room temperature self-healing coatings.

A versatile method to prepare size- and shape-controlled copper nanocubes using an aqueous phase green synthesis

RSC Advances ◽  
2016 ◽  
Vol 6 (94) ◽  
pp. 91949-91955 ◽  
Author(s):  
Thulitha Abeywickrama ◽  
Niharika Neerudu Sreeramulu ◽  
Lan Xu ◽  
Hemali Rathnayake
Keyword(s):  
Aqueous Solution ◽  
Green Synthesis ◽  
Aqueous Phase ◽  
Room Temperature ◽  
Environmentally Friendly ◽  
Size And Shape ◽  
Controlled Morphology ◽  
Shape Controlled ◽  
Environmentally Friendly Method

A versatile, simple, and environmentally friendly method of preparing copper nanocubes with controlled morphology in aqueous solution at room temperature is demonstrated to make Cu nanocubes with sizes of 100 ± 35 nm.

scholarly journals Investigation an environmentally friendly method under magnetic field as a green solvent for the synthesis of brookite phase nanoparticles at room temperature

2021 ◽  
Author(s):  
Yahya Absalan ◽  
Mostafa Gholizadeh ◽  
Vladimir Viktorovich Kopylov ◽  
Leonid Alekseevich Butsov ◽  
Olga Kovalchukova
Keyword(s):  
Magnetic Field ◽  
Room Temperature ◽  
High Surface ◽  
Environmentally Friendly ◽  
Green Solvent ◽  
Magnetized Water ◽  
The Us ◽  
Environmentally Friendly Method ◽  
Brookite Phase ◽  
High Surface Activity

Abstract TiO2 nanoparticles in the brookite phase were synthesized within an environmentally friendly method by magnetized water obtained by the US-patent magnetizing device (US10507450B2), which changes the properties of all types of the solvents with no limitation (protic or aprotic). Furthermore, this study is the first report on the synthesis of brookite TiO2 nanoparticle through magnetized water at room temperature. The procedure was tested by five different water; ordinary, 15, 30, 45, and 60min-magnetized water. The products were analyzed by various techniques including XRD, FESEM, ICP, BJH-plot, t-plot, Langmuir plot, BET, TEM, and FTIR. The result showed that the products obtained from 30 min-magnetized water were the most properly indexed TiO2 brookite phase with high surface activity. This sample could be a suitable green photocatalyst.

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.

Nickel (II) and oxovanadium (IV) complexes supported on MCM-41 mesoporous and their application in catalytic selective sulfide and thiol oxidation

2020 ◽  
Vol 23 ◽  
Author(s):  
Mohsen Nikoorazm ◽  
Maryam Khanmoradi ◽  
Masoumeh Sayadian
Keyword(s):  
Catalytic Activity ◽  
Room Temperature ◽  
Sol Gel ◽  
Reaction Times ◽  
Significant Loss ◽  
Spectral Studies ◽  
High Catalytic Activity ◽  
Catalytic Systems ◽  
Solvent Free Conditions ◽  
Mcm 41

Introduction:: MCM-41 was synthesized using the sol-gel method. Then two new transition metal complexes of Nickel (II) and Vanadium (IV), were synthesized by immobilization of adenine (6-aminopurine) into MCM-41 mesoporous. The compounds have been characterized by XRD, TGA, SEM, AAS and FT-IR spectral studies. Using these catalysts provided an efficient and enantioselective procedure for oxidation of sulfides to sulfoxides and oxidative coupling of thiols to their corresponding disulfides using hydrogen peroxide at room temperature. Materials and Methods:: To a solution of sulfide or thiol (1 mmol) and H2O2 (5 mmol), a determined amount of the catalyst was added. The reaction mixture was stirred at room temperature for the specific time under solvent free conditions. The progress of the reaction was monitored by TLC using n-hexane: acetone (8:2). Afterwards, the catalyst was removed from the reaction mixture by centrifugation and, then, washed with dichloromethane in order to give the pure products. Results:: All the products were obtained in excellent yields and short reaction times indicating the high activity of the synthesized catalysts. Besides, the catalysts can be recovered and reused for several runs without significant loss in their catalytic activity. Conclusion:: These catalytic systems furnish the products very quickly with excellent yields and VO-6AP-MCM-41 shows high catalytic activity compared to Ni-6AP-MCM-41.

scholarly journals Organophotocatalytic selective deuterodehalogenation of aryl or alkyl chlorides

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yanjun Li ◽  
Ziqi Ye ◽  
Yu-Mei Lin ◽  
Yan Liu ◽  
Yumeng Zhang ◽  
...  
Keyword(s):  
Room Temperature ◽  
Sodium Formate ◽  
Bioactive Molecules ◽  
Co Catalyst ◽  
Aryl Chlorides ◽  
Aryl Amine ◽  
Drug Molecules ◽  
Photocatalytic System ◽  
Site Selective ◽  
Environmentally Friendly Method

AbstractDevelopment of practical deuteration reactions is highly valuable for organic synthesis, analytic chemistry and pharmaceutic chemistry. Deuterodehalogenation of organic chlorides tends to be an attractive strategy but remains a challenging task. We here develop a photocatalytic system consisting of an aryl-amine photocatalyst and a disulfide co-catalyst in the presence of sodium formate as an electron and hydrogen donor. Accordingly, many aryl chlorides, alkyl chlorides, and other halides are converted to deuterated products at room temperature in air (>90 examples, up to 99% D-incorporation). The mechanistic studies reveal that the aryl amine serves as reducing photoredox catalyst to initiate cleavage of the C-Cl bond, at the same time as energy transfer catalyst to induce homolysis of the disulfide for consequent deuterium transfer process. This economic and environmentally-friendly method can be used for site-selective D-labeling of a number of bioactive molecules and direct H/D exchange of some drug molecules.

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