Effective catalytic conversion of cellulose into high yields of methyl glucosides over sulfonated carbon based catalyst

2012 ◽  
Vol 120 ◽  
pp. 318-321 ◽  
Author(s):  
Sambha Dora ◽  
Thallada Bhaskar ◽  
Rawel Singh ◽  
Desavath Viswanatha Naik ◽  
Dilip Kumar Adhikari
Keyword(s):  
Catalytic Conversion ◽  
High Yields ◽  
Carbon Based

Efficient catalytic conversion of fructose into hydroxymethylfurfural by a novel carbon-based solid acid

2011 ◽  
Vol 13 (10) ◽  
pp. 2678 ◽  
Author(s):  
Jianjian Wang ◽  
Wenjie Xu ◽  
Jiawen Ren ◽  
Xiaohui Liu ◽  
Guanzhong Lu ◽  
...  
Keyword(s):  
Solid Acid ◽  
Catalytic Conversion ◽  
Carbon Based

Synthesis of Pentacoordinated Spiro[4,4]phosphoranes by Reaction of Cyclic Phosphazenyl Anions with Epoxides. Study of their P-Remote Functionalization and Hydrolysis

Synthesis ◽  
2021 ◽  
Author(s):  
Pablo Manuel Sansores Peraza ◽  
Jesús García López ◽  
Yolanda Navarro ◽  
María José Iglesias ◽  
Fernando López Ortiz
Keyword(s):  
Benzoic Acid ◽  
Alkaline Hydrolysis ◽  
Phosphorus Atom ◽  
Bidentate Ligand ◽  
New Family ◽  
Acid Catalyzed ◽  
High Yields ◽  
Hydrolysis Of ◽  
Carbon Based

The synthesis of a new family of pentacoordinated spiro[4,4]phosphoranes stabilized by the ortho-benzamide bidentate ligand (oBA,-C6H4-2-C(O)NH-) through reaction of Cα -Cortho-dilithiated phosphazenes with oxiranes is reported. Mixtures of epimers that differ in configuration at the phosphorus atom were obtained with moderate to high yields and diastereoselectivities. C3-disubstituted derivatives could be separated, which provided access to enantiopure products arising from the reaction with (R)-2-phenyloxirane. Stereomutation was observed by heating the spirophosphoranes at 100 ºC. Directed ortho lithiation of spirophoshoranes followed by electrophilic quench reactions including carbon-based and heteroatom-based electrophiles afforded derivatives functionalized in remote position with respect to the phosphorus atom. Benzoic acid catalyzed hydrolysis of spirophosphoranes furnished ortho-(hydroxyalkylphosphoryl)benzamides by cleavage of the P‒O and P‒N bonds with retention of the phosphorus configuration. In contrast, alkaline hydrolysis led to the formation of γ-hydroxyphosphinic acids and benzamide.

Selective Conversion of CO2 and Switchable Alcohols into Linear or Cyclic Carbonates via Versatile Zinc Catalysis

Synthesis ◽  
2018 ◽  
Vol 51 (03) ◽  
pp. 739-746 ◽  
Author(s):  
Qing-Wen Song ◽  
Ping Liu ◽  
Qing-Ning Zhao ◽  
Jing-Yuan Li ◽  
Kan Zhang
Keyword(s):  
Noble Metal ◽  
Catalytic Conversion ◽  
Metal Catalyst ◽  
Cyclic Carbonates ◽  
Noble Metal Catalyst ◽  
Primary Alcohols ◽  
Selective Conversion ◽  
High Yields ◽  
Zinc Catalysis ◽  
Excellent Selectivity

It is promising and challenging to achieve the effective construction of carbonates using CO2 and a non-noble metal catalyst. Herein, selective catalytic conversion of CO2 and switchable alcohol candidates to produce linear or cyclic carbonates and α-hydroxy ketones via effective zinc catalyst was developed. A series of primary alcohols and cyclohexanol, 1,2-diols, and water can serve as nucleophiles to give alkyl or aryl 2-substituted-3-oxobutan-2-yl carbonates, substituted 1,3-dioxolan-2-ones, 3-substituted 3-hydroxybutan-2-ones, respectively with excellent selectivity and high yields.

Coaled Carbon-Based Solid Acid: a New and Efficient Catalyst for Click Synthesis of 3,4-Dihydropyrimidin-2(1H)-Ones under Solvent-Free Conditions

2013 ◽  
Vol 634-638 ◽  
pp. 504-507
Author(s):  
Wan Yi Liu ◽  
Ning Liu ◽  
Rui Yuan Zheng ◽  
Bing Li ◽  
Xia Zhang ◽  
...  
Keyword(s):  
Solid Acid ◽  
Reaction Times ◽  
Solvent Free ◽  
Multicomponent Synthesis ◽  
Efficient Catalyst ◽  
Solvent Free Conditions ◽  
Important Addition ◽  
High Yields ◽  
Work Up ◽  
Carbon Based

Coaled carbon-based solid acid (CCBSAC) is reported as a new, efficient and recyclable catalyst for the regioselective multicomponent synthesis of dihydropyrimidin-2(1H)-ones from aldehydes, β-ketoesters and urea or thiourea under solvent-free conditions. The structure and thermal stability of CCBSAC which resulted from ultra-clean coal resources mainly were characterized by IR, XRD, and TG. Nineteen dihydropyrimidin-2(1H)-ones examples were prepared and this catalyst could recycle up to 4 consecutive runs without losing its efficiency. The high yields of products, short reaction times, ease of work-up and clean procedure will make the present method a useful and important addition to the previous methodologies for the synthesis of dihydropyrimidin-2(1H)-ones.

Catalytic conversion of cellulose into 5-hydroxymethylfurfural in high yields via a two-step process

Cellulose ◽  
2011 ◽  
Vol 18 (5) ◽  
pp. 1327-1333 ◽  
Author(s):  
Xinhua Qi ◽  
Masaru Watanabe ◽  
Taku M. Aida ◽  
Richard L. Smith
Keyword(s):  
Catalytic Conversion ◽  
Step Process ◽  
High Yields

scholarly journals Polyethylene upcycling to long-chain alkylaromatics by tandem hydrogenolysis/aromatization

Science ◽  
2020 ◽  
Vol 370 (6515) ◽  
pp. 437-441 ◽  
Author(s):  
Fan Zhang ◽  
Manhao Zeng ◽  
Ryan D. Yappert ◽  
Jiakai Sun ◽  
Yu-Hsuan Lee ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Waste Disposal ◽  
Reaction Temperature ◽  
Molecular Hydrogen ◽  
Catalytic Conversion ◽  
Weight Percent ◽  
Low Molecular Weight ◽  
Moderate Reaction ◽  
High Yields ◽  
Long Chain

The current scale of plastics production and the accompanying waste disposal problems represent a largely untapped opportunity for chemical upcycling. Tandem catalytic conversion by platinum supported on γ-alumina converts various polyethylene grades in high yields (up to 80 weight percent) to low-molecular-weight liquid/wax products, in the absence of added solvent or molecular hydrogen, with little production of light gases. The major components are valuable long-chain alkylaromatics and alkylnaphthenes (average ~C30, dispersity Ð = 1.1). Coupling exothermic hydrogenolysis with endothermic aromatization renders the overall transformation thermodynamically accessible despite the moderate reaction temperature of 280°C. This approach demonstrates how waste polyolefins can be a viable feedstock for the generation of molecular hydrocarbon products.

Synthesis of Ni/mesoporous ZSM-5 for direct catalytic conversion of cellulose to hexitols: modulating the pore structure and acidic sites via a nanocrystalline cellulose template

2016 ◽  
Vol 18 (11) ◽  
pp. 3315-3323 ◽  
Author(s):  
Bin Zhang ◽  
Xiaoru Li ◽  
Qifan Wu ◽  
Chao Zhang ◽  
Yancun Yu ◽  
...  
Keyword(s):  
Pore Structure ◽  
Catalytic Conversion ◽  
Direct Conversion ◽  
Nanocrystalline Cellulose ◽  
Acidic Sites ◽  
High Yields

Direct conversion of cellulose to hexitols with high yields was achieved over NCC-templated Ni/mesoporous ZSM-5 catalysts.

Catalytic conversion of cellulose to sorbitol over Ru supported on biomass-derived carbon-based materials

2019 ◽  
Vol 256 ◽  
pp. 117826 ◽  
Author(s):  
Natalia Rey-Raap ◽  
Lucília Sousa Ribeiro ◽  
José J. de Melo Órfão ◽  
José L. Figueiredo ◽  
Manuel Fernando Ribeiro Pereira
Keyword(s):  
Catalytic Conversion ◽  
Carbon Based
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