Water-Soluble Pd–Imidate Complexes: Broadly Applicable Catalysts for the Synthesis of Chemically Modified Nucleosides via Pd-Catalyzed Cross-Coupling

2016 ◽  
Vol 81 (7) ◽  
pp. 2713-2729 ◽  
Author(s):  
Vijay Gayakhe ◽  
Ajaykumar Ardhapure ◽  
Anant R. Kapdi ◽  
Yogesh S. Sanghvi ◽  
Jose Luis Serrano ◽  
...  
Keyword(s):  
Cross Coupling ◽  
Water Soluble ◽  
Modified Nucleosides ◽  
Chemically Modified

ChemInform Abstract: Facile-Prepared Sulfonated Water-Soluble PEPPSI-Pd-NHC Catalysts for Aerobic Aqueous Suzuki-Miyaura Cross-Coupling Reactions.

ChemInform ◽  
2015 ◽  
Vol 46 (17) ◽  
pp. no-no
Author(s):  
Rui Zhong ◽  
Alexander Poethig ◽  
Yinkai Feng ◽  
Korbinian Riener ◽  
Wolfgang A. Herrmann ◽  
...  
Keyword(s):  
Cross Coupling ◽  
Water Soluble ◽  
Coupling Reactions ◽  
Cross Coupling Reactions

Direct Access to Unique C‐5’‐acyl Modified Nucleosides through Liebeskind‐Srogl Cross Coupling Reaction

2021 ◽  
Author(s):  
Mary Anne Maverick ◽  
Marie Gaillard ◽  
Jean-Jacques Vasseur ◽  
Françoise Debart ◽  
Michael Smietana
Keyword(s):  
Coupling Reaction ◽  
Cross Coupling ◽  
Modified Nucleosides ◽  
Direct Access ◽  
Cross Coupling Reaction

New Carbohydrate-Based Polymeric Materials

MRS Bulletin ◽  
1992 ◽  
Vol 17 (10) ◽  
pp. 54-59 ◽  
Author(s):  
Matthew R. Callstrom ◽  
Mark D. Bednarski
Keyword(s):  
Food Additives ◽  
Polymeric Materials ◽  
Water Soluble ◽  
Natural Polymers ◽  
Water Soluble Polymers ◽  
Soluble Polymers ◽  
Chemically Modified ◽  
Stereochemical Control ◽  
Natural Polysaccharide ◽  
Image Position

The total world production of water-soluble polymers is estimated to be greater than five million tons per year. Water-soluble polymers are most conveniently described according to their origin in three classes (see Structures 1-6):∎ Natural polymers, including starch (1) and cellulose (2);∎ chemically modified natural polymers, including, for example, hydroxyethyl starch (3) and cellulose acetate (4); and∎ synthetic polymers, the most important of which are polyacrylamide (5) and polyvinyl alcohol (6), (commonly composed of both alcohol and acetate groups as shown). The widespread use of these materials is due to both their availability and the range of useful physical properties found in the various natural and chemically modified natural polymers.Of the commercial water-soluble polymers, approximately 50–80% are based on natural polysaccharide materials. One of the primary reasons that these materials find such widespread use is the dramatic response of their properties to changes in their functionality and stereochemistry: chemical modification or the combination of polysaccharides with other polymeric materials has yielded materials whose applications range from explosives to food additives. Although efforts directed at controlling the properties of polysaccharides has resulted in a wide variety of useful materials, we felt control of the composition of carbohydrate-based polymers at the molecular level would provide materials with properties superior to those derived from natural and chemically modified polysaccharide materials.Our approach for the preparation of new carbohydrate-based materials is to use the carbohydrate as a template for the introduction of desired functionality with complete regiochemical and stereochemical control by both chemical and enzymatic methods (Scheme I).

scholarly journals Improved efficiency in organic solar cells via conjugated polyelectrolyte additive in the hole transporting layer

2016 ◽  
Vol 4 (45) ◽  
pp. 10722-10730 ◽  
Author(s):  
Chan Kyu Kwak ◽  
Gabriel E. Pérez ◽  
Benjamin G. Freestone ◽  
Sulaiman A. Al-Isaee ◽  
Ahmed Iraqi ◽  
...  
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Power Conversion Efficiency ◽  
Organic Solar Cells ◽  
Power Conversion ◽  
Cross Coupling ◽  
Water Soluble ◽  
Conjugated Polyelectrolyte ◽  
Hole Charge ◽  
Hole Transporting

The water soluble conjugated polyelectrolyte was synthesised by Suzuki cross coupling and increased the power conversion efficiency by improving hole charge transfer from active layer into the hole transporting layer.

A Water Soluble Ni-Schiff Base Complex for Homogeneous Green Catalytic C–S Cross-Coupling Reactions

2021 ◽  
pp. 120755
Author(s):  
Biplab Biswas ◽  
Prasun Choudhury ◽  
Angshuman Ghosh ◽  
Soumen Kumar Dubey ◽  
Corrado Rizzoli ◽  
...  
Keyword(s):  
Schiff Base ◽  
Schiff Base Complex ◽  
Cross Coupling ◽  
Water Soluble ◽  
Coupling Reactions ◽  
Base Complex ◽  
Cross Coupling Reactions

Chemical modification results in hyperactivation and thermostabilization ofFusarium solaniglucoamylase

2007 ◽  
Vol 53 (2) ◽  
pp. 177-185 ◽  
Author(s):  
Haq Nawaz Bhatti ◽  
M. Hamid Rashid ◽  
Muhammad Asgher ◽  
Rakhshanda Nawaz ◽  
A.M. Khalid ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Chemical Modification ◽  
Soluble Starch ◽  
Water Soluble ◽  
Chemically Modified ◽  
Free Energy Of Activation ◽  
Enthalpy Of Activation ◽  
Specificity Constant ◽  
Modified Forms ◽  
Thermal Stability Of

Chemical modification of carboxyl groups of glucoamylase from a mesophilic fungus, Fusarium solani , was carried out using ethylenediamine as nucleophile in the presence of water-soluble 1-ethyl-3(3-dimethylaminopropyl)carbodiimide. Modification brought about a dramatic enhancement of catalytic activity and thermal stability of glucoamylase. Temperature and pH optima of ethylenediamine-coupled glucoamylase (ECG) increased as compared with those of native enzyme. The specificity constant (kcat/Km) of native, ECG-2, ECG-11, and ECG-17 was 136, 173, 225, and 170, respectively, at 55 °C. The enthalpy of activation (ΔH*) and free energy of activation (ΔG*) for soluble starch hydrolysis were lower for the chemically modified forms. All of the modified forms werestable at higher temperatures and possessed high ΔG* against thermal unfolding. The effects of α-chymotrypsin and subtilisin on the modified forms were activating as compared with native. Moreover, denaturation of ECG-2, ECG-11, and ECG-17 in urea at 4 mol·L–1also showed an activation trend. A possible explanation for the thermal denaturation of native and increased thermal stability of ECG-2, ECG-11, and ECG-17 at higher temperatures is also discussed.

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