Efficient solvent free synthesis of tertiary α-aminophosphonates using H2Ti3O7 nanotubes as a reusable solid-acid catalyst

2015 ◽  
Vol 39 (12) ◽  
pp. 9605-9610 ◽  
Author(s):  
Bhoomireddy Rajendra Prasad Reddy ◽  
Peddiahgari Vasu Govardhana Reddy ◽  
Bijivemula N. Reddy
Keyword(s):  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Solvent Free ◽  
Solid Acid Catalysts ◽  
Secondary Amines ◽  
Acid Catalysts ◽  
Dialkyl Phosphites ◽  
Solvent Free Synthesis

The Kabachnik–Fields reaction was applied for the synthesis of α-aminophosphonates from aldehydes, secondary amines and dialkyl phosphites in the presence of H2Ti3O7 nanotubes as reusable solid-acid catalysts.

Polyvinyl trisulfonate ethylamine based solid acid catalyst for the efficient glycosylation of sugars under solvent free conditions

RSC Advances ◽  
2015 ◽  
Vol 5 (127) ◽  
pp. 104715-104724 ◽  
Author(s):  
Avinash A. Chaugule ◽  
Amol R. Jadhav ◽  
Hern Kim
Keyword(s):  
Catalytic Activity ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Solvent Free ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Solvent Free Conditions ◽  
Acid Catalyzed

We have synthesized Brønsted solid acid catalysts which exhibited effective catalytic activity for acid catalyzed glycosylation reactions.

Ordered mesoporous zirconium oxophosphate supported tungsten oxide solid acid catalysts: the improved Brønsted acidity for benzylation of anisole

RSC Advances ◽  
2014 ◽  
Vol 4 (43) ◽  
pp. 22509-22519 ◽  
Author(s):  
Zhichao Miao ◽  
Huahua Zhao ◽  
Huanling Song ◽  
Lingjun Chou
Keyword(s):  
Tungsten Oxide ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Brønsted Acidity ◽  
Brönsted Acidity ◽  
Ordered Mesoporous

A series of WO3 supported on ordered mesoporous zirconium oxophosphate solid acid catalyst was employed in benzylation reaction.

ChemInform Abstract: Efficient Solvent Free Synthesis of Tertiary α-Aminophosphonates Using H2Ti3O7Nanotubes as a Reusable Solid-Acid Catalyst.

ChemInform ◽  
2016 ◽  
Vol 47 (15) ◽  
pp. no-no
Author(s):  
Bhoomireddy Rajendra Prasad Reddy ◽  
Peddiahgari Vasu Govardhana Reddy ◽  
Bijivemula N. Reddy
Keyword(s):  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Solvent Free ◽  
Solvent Free Synthesis

Phospho sulfonic acid: an efficient and recyclable solid acid catalyst for the solvent-free synthesis of α-hydroxyphosphonates and their anticancer properties

2015 ◽  
Vol 39 (5) ◽  
pp. 3916-3922 ◽  
Author(s):  
Reddi Mohan Naidu Kalla ◽  
Hye Ri Lee ◽  
Jiafu Cao ◽  
Jin-Wook Yoo ◽  
Il Kim
Keyword(s):  
Anticancer Activity ◽  
Sulfonic Acid ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Solvent Free ◽  
Green Protocol ◽  
Anticancer Properties ◽  
Solvent Free Synthesis

Some of the title compounds synthesized by a green protocol showed potent anticancer activity.

Solvent free synthesis of methyl palmitate over sulfated zirconia solid acid catalyst

Fuel ◽  
2016 ◽  
Vol 165 ◽  
pp. 298-305 ◽  
Author(s):  
K. Saravanan ◽  
Beena Tyagi ◽  
Ram S. Shukla ◽  
Hari C. Bajaj
Keyword(s):  
Sulfated Zirconia ◽  
Methyl Palmitate ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Solvent Free ◽  
Solvent Free Synthesis

scholarly journals A New Method for Solid Acid Catalyst Evaluation for Cellulose Hydrolysis

2021 ◽  
Vol 2 (4) ◽  
pp. 645-669
Author(s):  
Maksim Tyufekchiev ◽  
Jordan Finzel ◽  
Ziyang Zhang ◽  
Wenwen Yao ◽  
Stephanie Sontgerath ◽  
...  
Keyword(s):  
Solid Acid ◽  
Reaction Pathway ◽  
Solid Acid Catalyst ◽  
False Negative ◽  
Acid Catalyst ◽  
Cellulose Hydrolysis ◽  
Solid Acids ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Supernatant Liquid

A systematic and structure-agnostic method for identifying heterogeneous activity of solid acids for catalyzing cellulose hydrolysis is presented. The basis of the method is preparation of a supernatant liquid by exposing the solid acid to reaction conditions and subsequent use of the supernatant liquid as a cellulose hydrolysis catalyst to determine the effects of in situ generated homogeneous acid species. The method was applied to representative solid acid catalysts, including polymer-based, carbonaceous, inorganic, and bifunctional materials. In all cases, supernatant liquids produced from these catalysts exhibited catalytic activity for cellulose hydrolysis. Direct comparison of the activity of the solid acid catalysts and their supernatants could not provide unambiguous detection of heterogeneous catalysis. A reaction pathway kinetic model was used to evaluate potential false-negative interpretation of the supernatant liquid test and to differentiate heterogeneous from homogeneous effects on cellulose hydrolysis. Lastly, differences in the supernatant liquids obtained in the presence and absence of cellulose were evaluated to understand possibility of false-positive interpretation, using structural evidence from the used catalysts to gain a fresh understanding of reactant–catalyst interactions. While many solid acid catalysts have been proposed for cellulose hydrolysis, to our knowledge, this is the first effort to attempt to differentiate the effects of heterogeneous and homogeneous activities. The resulting supernatant liquid method should be used in all future attempts to design and develop solid acids for cellulose hydrolysis.

Efficient synthesis of diphenyl carbonate from dibutyl carbonate and phenol using square-shaped Zn–Ti–O nanoplates as solid acid catalysts

RSC Advances ◽  
2015 ◽  
Vol 5 (103) ◽  
pp. 84621-84626 ◽  
Author(s):  
Peixue Wang ◽  
Shimin Liu ◽  
Feng Zhou ◽  
Benqun Yang ◽  
Ahmad S. Alshammari ◽  
...  
Keyword(s):  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Solid Acid Catalysts ◽  
Diphenyl Carbonate ◽  
Acid Catalysts ◽  
Efficient Synthesis

Efficient synthesis of diphenyl carbonate from dibutyl carbonate and phenol using square-shaped Zn–Ti–O nanoplates as solid acid catalyst.

scholarly journals Pre-treatment of biomasses using magnetised sulfonic acid catalysts

2017 ◽  
Vol 48 (2) ◽  
pp. 117 ◽  
Author(s):  
Yane Ansanay ◽  
Praveen Kolar ◽  
Ratna Sharma-Shivappa ◽  
Jay Cheng ◽  
Sunkyu Park ◽  
...  
Keyword(s):  
Sulfonic Acid ◽  
Panicum Virgatum ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Miscanthus Giganteus ◽  
Panicum Virgatum L ◽  
Pre Treatment

There is a significant interest in employing solid acid catalysts for pre-treatment of biomasses for subsequent hydrolysis into sugars, because solid acid catalysts facilitate reusability, high activity, and easier separation. Hence the present research investigated pretreatment of four lignocellulosic biomasses, namely Switchgrass (Panicum virgatum L ‘Alamo’), Gamagrass (Tripsacum dactyloides), Miscanthus (Miscanthus × giganteus) and Triticale hay (Triticale hexaploide Lart.) at 90°C for 2 h using three carbon-supported sulfonic acid catalysts. The catalysts were synthesized via impregnating p-Toluenesulfonic acid on carbon (regular) and further impregnated with iron nitrate via two methods to obtain magnetic A and magnetic B catalysts. When tested as pre-treatment agents, a maximum total lignin reduction of 17.73±0.63% was observed for Triticale hay treated with magnetic A catalyst. Furthermore, maximum glucose yield after enzymatic hydrolysis was observed to be 203.47±5.09 mg g–1 (conversion of 65.07±1.63%) from Switchgrass treated with magnetic A catalyst. When reusability of magnetised catalysts were tested, it was observed that magnetic A catalyst was consistent for Gamagrass, Miscanthus × Giganteus and Triticale hay, while magnetic B catalyst was found to maintain consistent yield for switchgrass feedstock. Our results suggested that magnetised solid acid catalyst could pre-treat various biomass stocks and also can potentially reduce the use of harsh chemicals and make bioenergy processes environment friendly.

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