Asymmetric hydrogenation of acrylic acid derivatives by novel chiral rhodium–phosphinediamine complex catalysts by selective ligation between two amino units of the ligand and electrostatic interaction

1997 ◽  
pp. 1869-1874 ◽  
Author(s):  
Issaku Yamada ◽  
Munetaka Ohkouchi ◽  
Motowo Yamaguchi ◽  
Takamichi Yamagishi
Keyword(s):  
Acrylic Acid ◽  
Electrostatic Interaction ◽  
Asymmetric Hydrogenation

In situ polymerization induced supramolecular hydrogels of chitosan and poly(acrylic acid-acrylamide) with high toughness

2017 ◽  
Vol 1 (2) ◽  
pp. 310-318 ◽  
Author(s):  
Jin Li ◽  
Zhilong Su ◽  
Xiaodong Ma ◽  
Hongjie Xu ◽  
Zixing Shi ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Acrylic Acid ◽  
Electrostatic Interaction ◽  
In Situ Polymerization ◽  
Supramolecular Hydrogel ◽  
High Toughness ◽  
Poly Acrylic Acid

A novel type of supramolecular hydrogel was developed byin situpolymerization of acrylic acid (AA) and acrylamide (AM) monomers in the aqueous solution of chitosan (CS) based on the dynamic electrostatic interaction of ions.

A novel chiral phosphinediamine ligand and asymmetric hydrogenation of acrylic acid derivatives

1996 ◽  
Vol 7 (12) ◽  
pp. 3339-3342 ◽  
Author(s):  
Issaku Yamada ◽  
Motowo Yamaguchi ◽  
Takamichi Yamagishi
Keyword(s):  
Acrylic Acid ◽  
Asymmetric Hydrogenation

The Synthesis of Amphiphilic Chiral Dendritic 1,1′-Bi-2-Naphthol Derivatives and their Application as Amphiphiles in Aqueous Asymmetric Hydrogenation

2002 ◽  
Vol 2002 (7) ◽  
pp. 318-320 ◽  
Author(s):  
Qing-Hua Fan ◽  
Rui Zhang ◽  
Guo-Jun Deng ◽  
Xiao-Min Chen
Keyword(s):  
Acrylic Acid ◽  
Aqueous Media ◽  
Asymmetric Hydrogenation ◽  
Optically Active ◽  
Coupling Reactions ◽  
Aryl Ether ◽  
Naphthol Derivatives

Six new amphiphilic chiral dendritic BINOLs were synthesised via coupling reactions of optically active BINOL and the Frèchet-type poly(aryl ether) dendrons with peripheral oligo(ethyleneglycol) groups, and were used as amphiphiles for promoting the asymmetric hydrogenation of 2-[p-(2-methylpropyl)- phenyl]acrylic acid in an aqueous media.

scholarly journals Effect of Counterions on the Interaction among Concentrated Spherical Polyelectrolyte Brushes

Polymers ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 1911
Author(s):  
Yunwei Wang ◽  
Li Li ◽  
Yiming Wang ◽  
Qingsong Yang ◽  
Zhishuang Ye ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Electrostatic Interaction ◽  
Wide Angle ◽  
Ordered Structure ◽  
X Ray ◽  
Polyelectrolyte Brushes ◽  
X Ray Scattering ◽  
Spherical Polyelectrolyte Brushes ◽  
Brush Layer ◽  
Ray Scattering

The effect of counterions on interactions among spherical polyelectrolyte brushes (SPBs) was systematically investigated by rheology, small-angle X-ray scattering (SAXS) and wide-angle X-ray scattering (WAXS). The SPB particles consist of a solid polystyrene (PS) core with a diameter of ca.100 nm and a chemically grafted poly-(acrylic acid) (PAA) brush layer. Metal ions of different valences (Na+, Mg2+ and Al3+) were used as counterions to study the interactions among concentrated SPBs. The so-called “structure factor peak” in SAXS, the “local ordered structure peak” in WAXS and rheological properties indicated the interactions among concentrated SPBs. Combining SAXS, WAXS and rheology, the formation mechanism of the local ordered structure among PAA chains in the overlapped area of adjacent SPB, which was generated due to the bridge function of counterions, was confirmed. In contrast, excessive counterions shielded the electrostatic interaction among PAA chains and destroyed the local ordered structure. This work enriches our understanding of the polyelectrolyte assembly in concentrated SPBs under the effect of counterions and lays the foundations for SPB applications.

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