Preparation, characterization and use of poly(4-vinylpyridinium) hydrogen sulfate salt as an eco-benign, efficient and reusable solid acid catalyst for the chemoselective 1,1-diacetate protection and deprotection of aldehydes

2011 ◽  
Vol 348 (1-2) ◽  
pp. 20-29 ◽  
Author(s):  
Nader Ghaffari Khaligh ◽  
Farhad Shirini
Keyword(s):  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Hydrogen Sulfate ◽  
Sulfate Salt

Caffeine hydrogen sulfate: a recyclable solid acid catalyst for mechanochemical synthesis of 2-arylbenzothiazoles

2021 ◽  
pp. 1-9
Author(s):  
Priyanka Kalal ◽  
Ayushi Sethiya ◽  
Jay Soni ◽  
Isha Patel ◽  
Divyani Gandhi ◽  
...  
Keyword(s):  
Mechanochemical Synthesis ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Hydrogen Sulfate

scholarly journals An Eco-Friendly Improved Protocol for the Synthesis of Bis(3-indolyl)methanes Using Poly(4-vinylpyridinium)hydrogen Sulfate as Efficient, Heterogeneous, and Recyclable Solid Acid Catalyst

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Janardhan Banothu ◽  
Rajitha Gali ◽  
Ravibabu Velpula ◽  
Rajitha Bavantula ◽  
Peter A. Crooks
Keyword(s):  
Organic Solvents ◽  
Substitution Reaction ◽  
Electrophilic Substitution ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Reaction Times ◽  
Acid Catalyst ◽  
Electrophilic Substitution Reaction ◽  
Hydrogen Sulfate ◽  
Work Up

Highly efficient and eco-friendly protocol for the synthesis of bis(3-indolyl)methanes by the electrophilic substitution reaction of indole with aldehydes catalyzed by poly(4-vinylpyridinium)hydrogen sulfate was described. Excellent yields, shorter reaction times, simple work-up procedure, avoiding hazardous organic solvents, and reusability of the catalyst are the most obvious advantages of this method.

Introduction of O-sulfonated poly(vinylpyrrolidonium) hydrogen sulfate as an efficient, and reusable solid acid catalyst for some solvent-free multicomponent reactions

RSC Advances ◽  
2016 ◽  
Vol 6 (50) ◽  
pp. 44794-44806 ◽  
Author(s):  
Omid Goli-Jolodar ◽  
Farhad Shirini ◽  
Mohadeseh Seddighi
Keyword(s):  
Multicomponent Reactions ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Acidity Function ◽  
Hydrogen Sulfate ◽  
Hammett Acidity Function ◽  
Ft Ir ◽  
Hydrogen Sulphate ◽  
Sulfonated Poly

In this work, O-sulfonated poly(vinylpyrrolidonium) hydrogen sulphate has been prepared as a powerful recyclable solid acid catalyst and characterized using a variety of techniques including elemental analysis, FT-IR, TGA, SEM, XRD, pH analysis and Hammett acidity function.

Caffeinium Hydrogen Sulfate: A Green Solid Acid Catalyst for Selective One-Pot Domino Knoevenagel-Michael Transformations

2018 ◽  
Vol 3 (39) ◽  
pp. 10909-10914 ◽  
Author(s):  
Shalini Agarwal ◽  
Roona Poddar ◽  
Mazaahir Kidwai ◽  
Mahendra Nath
Keyword(s):  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Hydrogen Sulfate ◽  
One Pot
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