Montmorillonite K30 Supported Tungstophosphoric Acid as an Efficient Catalyst for Condensation Reaction of Methyl N-phenylcarbamate for Generating Diurethane

2021 ◽  
Author(s):  
Anh Vy Tran ◽  
Hye Jin Lee ◽  
Joon Hyun Baik ◽  
Jayeon Baek ◽  
Yong Jin Kim
Keyword(s):  
Condensation Reaction ◽  
Tungstophosphoric Acid ◽  
Efficient Catalyst

The Silver Salt of 12-Tungstophosphoric Acid: An Efficient Catalyst for the Three-Component Coupling of an Aldehyde, an Amine and an Alkyne.

ChemInform ◽  
2007 ◽  
Vol 38 (6) ◽  
Author(s):  
K. Mohan Reddy ◽  
N. Seshu Babu ◽  
I. Suryanarayana ◽  
P. S. Sai Prasad ◽  
N. Lingaiah
Keyword(s):  
Silver Salt ◽  
Tungstophosphoric Acid ◽  
Efficient Catalyst ◽  
Three Component Coupling

A Green and Sustainable Approach for Acetalization of Benzaldehyde Using Tungstophosphoric Acid Loaded on Metal Oxide Catalysts

2019 ◽  
Vol 41 (5) ◽  
pp. 805-805
Author(s):  
Li Fanghao Li Fanghao ◽  
Li Chenjie Li Chenjie ◽  
Chen Junyi Chen Junyi ◽  
Wang Kuiwu Wang Kuiwu ◽  
Zhang Haijiang Zhang Haijiang ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Condensation Reaction ◽  
High Surface ◽  
High Surface Area ◽  
Synergetic Effect ◽  
Reaction Model ◽  
Oxide Catalysts ◽  
Tungstophosphoric Acid ◽  
Impregnation Method ◽  
Metal Oxide Catalysts

A series of tungstophosphoric acid (H3PW12O40; HPW) loaded on metal oxide catalysts, namely H3PW12O40/M (M= TiO2, CeO2, ZrO2) was prepared by initial wetting impregnation method and their catalytic performances were also investigated during the condensation reaction of benzaldehyde with glycol. Among them, the 20 wt% H3PW12O40/TiO2 catalyst demonstrated highly active with superior acetal yield (90.1 %) and excellent durability. The high activity of the catalyst derived from high surface area, ultra-strong Brand#248;nsted acidity and synergetic effect of Brand#248;nsted-Lewis acid. Response surface methodology (RSM) based on Box-Behnken design (BBD) was used to optimize the course of the condensation reaction of benzaldehyde with glycol, and the optimal benzaldehyde glycol acetal yield (93.4 %) could be obtained. The optimized yield and the experimental results are similar. Moreover, under optimal reaction conditions, the activation energy (Ea) of reaction could be obtained through the kinetic study of the irreversible parallel reaction model, and the Ea was 23.24 kJ/mol.

12-Tungstophosphoric acid niched in Zr-based metal-organic framework: a stable and efficient catalyst for Friedel-Crafts acylation

2018 ◽  
Vol 61 (4) ◽  
pp. 402-411 ◽  
Author(s):  
Latif Ullah ◽  
Guoying Zhao ◽  
Zichen Xu ◽  
Hongyan He ◽  
Muhammad Usman ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Tungstophosphoric Acid ◽  
Efficient Catalyst ◽  
Metal Organic ◽  
Organic Framework

Environmentally benign synthesis of methyl 6-amino-5-cyano-4-aryl-2,4-dihydropyrano[2,3-c]pyrazole-3-carboxylates using CeO2 nanoparticles as a reusable and robust catalyst

2016 ◽  
Vol 71 (11) ◽  
pp. 1135-1140 ◽  
Author(s):  
Javad Safaei-Ghomi ◽  
Mehrnoosh Asgari-Kheirabadi ◽  
Hossein Shahbazi-Alavi
Keyword(s):  
Condensation Reaction ◽  
Ceo2 Nanoparticles ◽  
Environmentally Benign ◽  
High Yield ◽  
Synthesis And Characterization ◽  
Dimethyl Acetylenedicarboxylate ◽  
One Pot ◽  
Efficient Catalyst ◽  
Benign Synthesis

AbstractIn this work, we report the synthesis and characterization of CeO2 nanoparticles as an efficient catalyst for the preparation of methyl 6-amino-5-cyano-4-aryl-2,4-dihydropyrano[2,3-c]pyrazole-3-carboxylates via one-pot four-component condensation reaction of dimethyl acetylenedicarboxylate, hydrazine hydrate, malononitrile, and aldehydes in aqueous medium. The use of a non-hazardous organic solvent, easy recovery of the catalyst, compatibility with various functional groups, and high yield of the products make the protocol attractive, greener, and economic.

scholarly journals Leucine: green and efficient catalyst for the synthesis of 4H-chromenes

2017 ◽  
Vol 10 (9) ◽  
pp. 3197-3202 ◽  
Author(s):  
Davood Azarifar ◽  
Younes Abbasi ◽  
Omolbanin Badalkhani
Keyword(s):  
Amino Acid ◽  
Condensation Reaction ◽  
Reaction Times ◽  
Aromatic Aldehydes ◽  
One Pot ◽  
Efficient Catalyst ◽  
Naturally Occurring ◽  
The One ◽  
High Yields ◽  
Work Up

Leucine, a naturally occurring α-amino acid, has been found as an effective catalyst to effect the one-pot three-component condensation reaction between aromatic aldehydes, malononitrile and 5,5-dimethyl-1,3-cyclohexanedione (dimedone). Various 2-amino-4-aryl-7,7-dimethyl-5-oxo-5,6,7,8-tetrahydro-4H-chromene-3-carbonitrile derivatives are conveniently prepared by these reactions in excellent yields. High yields, short reaction times, simple work-up, use of green and naturally occurring catalyst and solvent are the main merits of the present protocol. 

scholarly journals Trifluoroacetic Acid as an Efficient Catalyst for the Room Temperature Synthesis of 2-Aryl-1-arylmethyl-1H-1,3-benzimidazoles in Aqueous Media

2011 ◽  
Vol 8 (1) ◽  
pp. 101-106 ◽  
Author(s):  
Mohammad R. Mohammadizadeh ◽  
S. Zeinakhatoun Taghavi
Keyword(s):  
Trifluoroacetic Acid ◽  
Room Temperature ◽  
Condensation Reaction ◽  
Aqueous Media ◽  
Aromatic Aldehydes ◽  
Temperature Synthesis ◽  
Efficient Catalyst ◽  
Room Temperature Synthesis ◽  
Effective Catalyst

Trifluoroacetic acid (TFA) is introduced as a commercially available, inexpensive and effective catalyst for the selective and eco-compatible synthesis of 2-aryl-1-arylmethyl-1H-1,3-benzimidazolesviacondensation reaction ofo-phenylenediamine derivatives and aromatic aldehydes in ethanol/water at room temperature.

Zinc oxide as an economical and efficient catalyst for the one-pot preparation of β-acetamido ketones via a four-component condensation reaction

2007 ◽  
Vol 48 (10) ◽  
pp. 1729-1734 ◽  
Author(s):  
Malek Taher Maghsoodlou ◽  
Asadollah Hassankhani ◽  
Hamid Reza Shaterian ◽  
Sayyed Mostafa Habibi-Khorasani ◽  
Elaheh Mosaddegh
Keyword(s):  
Zinc Oxide ◽  
Condensation Reaction ◽  
One Pot ◽  
Efficient Catalyst ◽  
The One

The silver salt of 12-tungstophosphoric acid: an efficient catalyst for the three-component coupling of an aldehyde, an amine and an alkyne

2006 ◽  
Vol 47 (43) ◽  
pp. 7563-7566 ◽  
Author(s):  
K. Mohan Reddy ◽  
N. Seshu Babu ◽  
I. Suryanarayana ◽  
P.S. Sai Prasad ◽  
N. Lingaiah
Keyword(s):  
Silver Salt ◽  
Tungstophosphoric Acid ◽  
Efficient Catalyst ◽  
Three Component Coupling
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