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Single-Handed Helical Polymer-Based Polycarboxylate with Achiral Triarylphosphine Pendants as Chiral Catalysts for Asymmetric Cross-Coupling Reactions in Pure Water.
J Am Chem Soc
March 2025
Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan.
Helical poly(quinoxaline-2,3-diyl)s (PQX) containing chiral carboxylic acid side chains derived from natural l-lactic acid were synthesized. The newly synthesized helical polycarboxylated polymer was soluble in basic pure water by forming polycarboxylate and adopted the -helical conformation (right-handed), whereas the -helical conformation is predominant under weakly acidic aqueous conditions. The water-soluble PQX containing additional monomer units bearing a 2-(diarylphosphino)phenyl group was employed in the asymmetric Suzuki-Miyaura coupling reaction in pure water in the absence of organic cosolvents.
View Article and Find Full Text PDFRevealing the Effects of Methoxy Polyethylene Glycol Ether on the Performance of Polycarboxylate Superplasticizers and Their Desensitization Functions in Relation to Concrete.
Materials (Basel)
February 2025
College of Materials Science and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
During the manufacture of high-strength concrete, its sensitivity to variations inconcrete mixing water, the poor adaptability of cement, and high hydration temperatures are often encountered. Therefore, in this paper, firstly, the esterification reaction of methoxy polyethylene glycol ether (MPEG) and methacrylic acid (MAA) was carried out. According to the different molecular weights of MPEG, three kinds of esterification products (MPEG-MAA) were synthesized.
View Article and Find Full Text PDFHelical Poly(quioxaline-2,3-diyl)-Based Poly(carboxylic acid)s as a Chiroptical Chemosensor for Detection and Quantification of Small Enantiomeric Imbalances of Chiral Amines in Water.
ACS Macro Lett
February 2025
Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan.
Achiral dynamic helical polymers, poly(quinoxaline-2,3-diyl)s ( and ) bearing achiral carboxylic acid side chains, i.e., carboxymethoxymethyl (in ) and carboxyethoxymethyl (in ), with different polymerization degrees were synthesized.
View Article and Find Full Text PDFHemiacetal Ester Side Chains as a Mild Protecting Group for Carboxylic Acids in Polycarbonate Backbones.
Macromol Rapid Commun
February 2025
Institute of Functional Materials and Biofabrication, Department of Chemistry and Pharmacy, Julius-Maximilians-Universität Würzburg, 97070, Würzburg, Germany.
Hemiacetal esters are versatile functional groups known for their unique ability to degrade under mild conditions such as exposure to water, alcohols, organic acids, or heat. In this study, hemiacetal esters are introduced as mild, transient protecting groups for carboxylic acids along polycarbonate backbones. A six-membered cyclic carbonate monomer is synthesized by reacting ethyl vinyl ether with a carboxylic acid precursor, demonstrating high efficiency and stability under nucleophilic polymerization conditions.
View Article and Find Full Text PDFAdvancements and Perspectives in Biodegradable Polyester Elastomers: Toward Sustainable and High-Performance Materials.
Int J Mol Sci
January 2025
Academy for Engineering and Technology, Yiwu Research Institute, Zhuhai Fudan Innovation Institute, Fudan University, Shanghai 200433, China.
While the traditional rubber industry faces the severe pressure of environmental pollution and carbon emissions, bio-based and biodegradable elastomers have become a hot topic in the field and drawn intensive research interest. Inspired by polyester resin, incorporating polyol or polycarboxylic acid as a branching unit into aliphatic polyester and/or introducing a monomer with a C=C bond to provide open-bond cross-linking in the fashion of common vulcanization to form three-dimensional network structures are two mainstream strategies for designing biodegradable polyester elastomers (BPEs). Both methods encounter more or fewer problems, such as poor mechanical and thermal properties due to the easy hydrolysis of the ester bond and space hinderance, or the potential harm of the remaining degraded small molecules with olefin bonds.
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