Bis-ammonium immobilized polystyrenes with co-catalyzing functional end groups as efficient and reusable heterogeneous catalysts for synthesis of cyclic carbonate from CO2 and epoxides

RSC Advances ◽  
2016 ◽  
Vol 6 (3) ◽  
pp. 2217-2224 ◽  
Author(s):  
Qingyuan Deng ◽  
Gaohong He ◽  
Yu Pan ◽  
Xuehua Ruan ◽  
Wenji Zheng ◽  
...  
Keyword(s):  
Functional Groups ◽  
Heterogeneous Catalysts ◽  
Cyclic Carbonate ◽  
Efficient Synthesis ◽  
End Groups

Novel bis-ammonium immobilized polystyrenes with co-catalyzing functional groups were prepared for efficient synthesis of cyclic carbonate from CO2 and epoxides.

Efficient synthesis of 5-hydroxymethylfurfural from mannose with a reusable MCM-41-supported tin catalyst

2018 ◽  
Vol 8 (21) ◽  
pp. 5526-5534 ◽  
Author(s):  
Songyan Jia ◽  
Xinjun He ◽  
Jiao Ma ◽  
Kangjun Wang ◽  
Zhanwei Xu ◽  
...  
Keyword(s):  
Heterogeneous Catalysts ◽  
Significant Loss ◽  
Efficient Synthesis ◽  
Tin Catalyst ◽  
Mcm 41

The Sn/MCM-41 catalyst was demonstrated to be effective for the conversion of mannose into 5-HMF, with comparable performances to those of reported heterogeneous catalysts. The Sn/MCM-41 catalyst was reusable without significant loss of activity after eight consecutive runs.

Bifunctional heterogeneous catalysts derived from the coordination of adenosine monophosphate to Sn(IV) for effective conversion of sucrose to 5-hydroxymethylfurfural

2021 ◽  
Author(s):  
Chenyu Wang ◽  
Lutong Jiao ◽  
Han Meng ◽  
Peijun Ji
Keyword(s):  
Metal Ions ◽  
Functional Groups ◽  
Heterogeneous Catalysts ◽  
Adenosine Monophosphate

Adenosine 5’-monophosphate (AMP) with multiple functional groups can bind to various metal ions. In this work, AMP has been used as the ligand to coordinate Sn(IV) for the synthesis of...

Efficient Synthesis of 3,4-Disubstituted 7-Azaindoles Employing SEM as a Dual Protecting–Activating Group

Synlett ◽  
2019 ◽  
Vol 30 (20) ◽  
pp. 2273-2278 ◽  
Author(s):  
Piroska Gyárfás ◽  
János Gerencsér ◽  
Warren S. Wade ◽  
László Ürögdi ◽  
Zoltán Novák ◽  
...  
Keyword(s):  
Functional Groups ◽  
Efficient Method ◽  
Reaction Times ◽  
Nucleophilic Aromatic Substitution ◽  
Aromatic Substitution ◽  
Efficient Synthesis ◽  
Mild Conditions

An efficient method for nucleophilic aromatic substitution on 7-azaindoles has been developed. The reaction is facilitated by the unique dual influence of SEM as both protecting and activating group, permitting mild conditions and short reaction times that are compatible with sensitive functional groups. The method is suitable for the synthesis of a broad range of products, most notably ethers.

scholarly journals Metal-Binding Q-Proline Macrocycles

2021 ◽  
Author(s):  
Justin Northrup ◽  
Jesse Wiener ◽  
Matthew Hurley ◽  
Chun-Feng David Hou ◽  
Taylor Keller ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Functional Groups ◽  
Metal Cation ◽  
Metal Binding ◽  
Metal Cations ◽  
Efficient Synthesis ◽  
Steric Interactions ◽  
Fmoc Spps

Herein, we introduce the efficient synthesis of Q-proline (Q-Pro) based, metal-binding macrocycles (QPM), which can display up to nine functional groups. Synthesis of eight QPM was achieved through standard Fmoc-SPPS and peptoid chemistry. QPM are disordered in the absence of a metal cation, as evidenced by NMR and a crystal structure of <b>QPM-3</b> obtained through racemic crystallization. Addition of metal cations cause these macrocycles to adopt ordered, uniform core structures regardless of the functional groups. Alkylation of QPM allows for addition of reactive functional groups as the final step in a synthesis. Interestingly, the addition of secondary functional groups to the hydantoin amide position (R<sub>2</sub>) converts the proline ring from Cg-endo to Cg-exo, due to steric interactions.

Diversifying Polyhydroxyalkanoates – End-Group and Side-Chain Functionality

2017 ◽  
Vol 14 (6) ◽  
pp. 757-767 ◽  
Author(s):  
Michal Michalak ◽  
Iwona Kwiecien ◽  
Michal Kwiecien ◽  
Grazyna Adamus ◽  
Karin Odelius ◽  
...  
Keyword(s):  
Functional Groups ◽  
Polymer Chain ◽  
Ring Opening ◽  
Functional Group ◽  
Side Chain ◽  
Natural Origin ◽  
Polymer Formation ◽  
End Groups ◽  
Group Diversity ◽  
End Group

Background: Polyhydroxyalkanoates (PHAs) are a natural origin biodegradable polyesters consisted of various 3- and 4-hydroxyacid derived repeating units produced by microorganisms as energy storage. PHAs have been intensively studied due to their biodegradability and biocompatibility enabling their use both in packaging and agriculture as well as in medicine and pharmacy. PHAs obtained via biotechnological routes can possess various functional groups in their side chains. However, the diversity in their functionality is limited due to issues of conservation of functional groups during the polymer formation. Objective: The review focuses on recent progress in the area of synthesis of PHAs functionalized with various reactive as well as bioactive end and side groups. Conclusion: A potent route to resolve the problem of functional group diversity in natural origin PHAs involves post-polymerization modification, where the desired side groups can be created. On the contrary, synthetically produced PHA analogs obtained directly via ring-opening polymerization of &beta;-lactones offer various functionalities at different position throughout the polymer chain. The desired &alpha;- and &omega;-end groups can be introduced into the polymer chain using specific polymerization, initiation or termination strategies, respectively. The preferred side chain functionality is obtained by choosing the appropriate &beta;-lactone monomers bearing respective functional groups. All functional groups may also be subjected to additional chemical modification. The degradation of PHA as a method for producing functional polymers as well as their possible further applications are also discussed.

Efficient CO2 fixation under ambient pressure using poly(ionic liquid)-based heterogeneous catalysts

2019 ◽  
Vol 3 (4) ◽  
pp. 935-941 ◽  
Author(s):  
Tanmoy Biswas ◽  
Venkataramanan Mahalingam
Keyword(s):  
Ionic Liquid ◽  
Heterogeneous Catalysts ◽  
Co2 Fixation ◽  
Ambient Pressure ◽  
Cyclic Carbonate ◽  
Efficient Catalyst ◽  
Poly Ionic Liquid

An ionic liquid-triazine and KI combination was found to be an efficient catalyst for epoxide to cyclic carbonate conversion under CO2 filled balloon conditions.

Coupling reaction of Aryl Halides Promoted by NiCl2/PPh3/Sm0

2002 ◽  
Vol 2002 (11) ◽  
pp. 562-563 ◽  
Author(s):  
Xingliang Zheng ◽  
Yongmin Zhang
Keyword(s):  
Functional Groups ◽  
Coupling Reaction ◽  
Aryl Halides ◽  
Efficient Synthesis ◽  
Mild Conditions ◽  
Coupling Reagent ◽  
High Yields

An efficient synthesis of biaryls from various aryl halides has been developed and investigated. The coupling reagent is a catalytic mixture of anhydrous NiCl2 and PPh3 in the presence of metallic samarium. The reaction occurs rapidly under mild conditions, tolerates a variety of functional groups with high yields.

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