A Simple Method to Synthese PNIPAM Hydrogel with Improved Response Rate by Conventional Radical Crosslinking Polymerization

2011 ◽  
Vol 236-238 ◽  
pp. 1483-1486
Author(s):  
Qun Feng Liu ◽  
Bo Yuan ◽  
Xiao Feng Chen
Keyword(s):  
Reaction Time ◽  
Low Temperature ◽  
Radical Polymerization ◽  
Response Rate ◽  
Swelling Ratio ◽  
Simple Method ◽  
Short Reaction Time

A kind of poly(N-isopropylacrylamide) (PNIPAM) gel was synthesized by radical polymerization of N-isopropylacrylamide monomer in the present of crosslinker N,N-Methylenebisacylamide using short reaction time. This kind of PNIPAM gel exhibits higher swelling ratio at low temperature and much faster deswelling rate than conventional gel, which could be attributed to the presence of loops, dangling chains and other incomplete structure in the gel caused by short reaction time.

Diastereoselective Addition of α-Metalated Sulfoxides to Imines Revisited: Mechanism, Computational Studies, and the Effect of External Chiral Ligands

2003 ◽  
Vol 68 (5) ◽  
pp. 885-898 ◽  
Author(s):  
Brian Pedersen ◽  
Tobias Rein ◽  
Inger Søtofte ◽  
Per-Ola Norrby ◽  
David Tanner
Keyword(s):  
Reaction Time ◽  
Low Temperature ◽  
Asymmetric Synthesis ◽  
Chiral Ligands ◽  
Quantum Mechanical ◽  
Kinetic Control ◽  
Computational Studies ◽  
Quantum Mechanical Calculations ◽  
Short Reaction Time ◽  
Diastereoselective Addition

Some new results on asymmetric synthesis via the addition of α-metalated methyl tolyl sulfoxides to imines are presented. Good diastereoselectivity (up to >98% d.e. for product 3g) can be obtained under conditions of kinetic control (short reaction time, low temperature). The transition state (a six-membered "flat chair") was probed by quantum mechanical calculations, which underpinned the idea of using external chiral ligands to enhance the diastereoselectivity of otherwise moderately selective reactions. In this way, the diastereomeric ratio of the product 3a could be raised from (84:16) to (>99:1) by use of a readily available C2-symmetric bis(sulfonamide) ligand.

Low temperature, shape-selective formation of Sb2Te3 nanomaterials and their thermoelectric applications

RSC Advances ◽  
2015 ◽  
Vol 5 (109) ◽  
pp. 89621-89634 ◽  
Author(s):  
U. Nithiyanantham ◽  
Sivasankara Rao Ede ◽  
M. Fevzi Ozaydin ◽  
Hong Liang ◽  
A. Rathishkumar ◽  
...  
Keyword(s):  
Reaction Time ◽  
Low Temperature ◽  
Thermoelectric Properties ◽  
Short Reaction Time ◽  
Shape Selective ◽  
Selective Formation

Thermoelectric properties of shape-selective Sb2Te3 nanomaterials which synthesized at a low temperature within a short reaction time have been reported.

scholarly journals Rapid and Economic Access to Some NSAIDS-Based Bioactive Heterocycles

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
A. V. Chavan ◽  
R. R. Somani ◽  
P. P. Kalantri ◽  
D. T. Makhija
Keyword(s):  
Reaction Time ◽  
Microwave Synthesis ◽  
Microwave Energy ◽  
The Other ◽  
Microwave Assisted Synthesis ◽  
Simple Method ◽  
Short Reaction Time ◽  
Microwave Assisted ◽  
Target Molecules ◽  
Bioactive Heterocycles

The use of microwave energy for the synthesis is considered as one of the alternate strategies. The present work includes the synthesis of some newer 2,5-disubstituted-1,3,4-oxadiazole analogues using both conventional and alternate rapid methods.The conventional method involves the synthesis of the target molecules by using cyclodehydrating agent like POCl3, while the other method consists of using some catalytic reagents like PbO2. Also, the short reaction time provided by microwave synthesis makes it ideal for the reaction. Hence, this project describes an efficient and operationally simple method for the microwave-assisted synthesis of some bioactive heterocycles based on NSAIDs.

Catalyzed Claisen–Schmidt reaction by protonated aluminate mesoporous silica nanomaterial focused on the (E)-chalcone synthesis as a biologically active compound

RSC Advances ◽  
2016 ◽  
Vol 6 (13) ◽  
pp. 11023-11031 ◽  
Author(s):  
Mohammad Reza Sazegar ◽  
Shaya Mahmoudian ◽  
Ali Mahmoudi ◽  
Sugeng Triwahyono ◽  
Aishah Abdul Jalil ◽  
...  
Keyword(s):  
Reaction Time ◽  
Low Temperature ◽  
Mesoporous Silica ◽  
Active Compound ◽  
Biologically Active ◽  
High Yield ◽  
Schmidt Reaction ◽  
Short Reaction Time ◽  
Biologically Active Compound ◽  
Catalyst Reusability

The energy saving HAlMSN catalyzed Claisen–Schmidt reaction for (E)-chalcone synthesis with high yield, low temperature, short reaction time and catalyst reusability.

One-pot synthesis of 5-[1-substituted 4-acetyl-5-methyl-1H-pyrrol-2-yl)]-8-hydroxyquinolines using DABCO as green catalyst

2015 ◽  
Vol 21 (4) ◽  
pp. 207-210 ◽  
Author(s):  
Shawkat Ahmed Abdelmohsen ◽  
Yasser Abou-bakr El-Ossaily
Keyword(s):  
Reaction Time ◽  
Environmentally Friendly ◽  
Catalytic Amount ◽  
One Pot ◽  
Simple Method ◽  
Green Catalyst ◽  
Short Reaction Time ◽  
H Nmr ◽  
One Pot Synthesis ◽  
Substituted Pyrroles

AbstractA green and simple method for the synthesis of the title compounds 4 by the reaction of 5-chloroacetyl-8-hydroxyquinoline (1), pentane-2,4-dione (2), and amines 3 in the presence of a catalytic amount of 1,4-diazabicyclo[2.2.2]octane at 60°C is described. The procedure is amenable for the synthesis of other substituted pyrroles. Short reaction time, environmentally friendly procedure, and excellent yields are the main advantages. The structures of products 4a–n were characterized by 1H NMR, IR, and MS spectra.

scholarly journals An Ultrasound Mediated Green Synthesis of Benzimidazolylthiounsaturatednitriles Using Water as a Green Solvent

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Sadhu Srinivas Rao ◽  
Chittireddy Venkata Ramana Reddy ◽  
Pramod Kumar Dubey
Keyword(s):  
Reaction Time ◽  
Green Synthesis ◽  
Ultrasonic Irradiation ◽  
Aromatic Aldehydes ◽  
Green Solvent ◽  
Simple Method ◽  
Short Reaction Time ◽  
Unsaturated Nitrile ◽  
Green Conditions

Reaction of 2-cyanothiomethylbenzimidazole  1 with an aromatic aldehydes in water under ultrasonic irradiation for 10–13 min gave the corresponding unsaturated nitriles 2a–h which is an efficient and simple method under green conditions. The unsaturated nitrile derivatives were obtained in 86–98% yield with a short reaction time without any tedious workup procedures.

Improved biodiesel manufacture at low temperature and short reaction time

2013 ◽  
Vol 53 ◽  
pp. 242-248 ◽  
Author(s):  
R. Alenezi ◽  
R.C.D. Santos ◽  
S. Raymahasay ◽  
G.A. Leeke
Keyword(s):  
Reaction Time ◽  
Low Temperature ◽  
Short Reaction Time

Tyrosine-Selective Bioconjugation with Iminoxyl Radicals

2020 ◽  
Author(s):  
Katsuya Maruyama ◽  
Takashi Ishiyama ◽  
Yohei Seki ◽  
Kounosuke Oisaki ◽  
Motomu Kanai
Keyword(s):  
Reaction Time ◽  
Steric Hindrance ◽  
Room Temperature ◽  
Water Soluble ◽  
Light Irradiation ◽  
Sodium Ascorbate ◽  
Iminoxyl Radical ◽  
Short Reaction Time ◽  
Modified Peptides ◽  
The Stability

A novel Tyr-selective protein bioconjugation using the water-soluble persistent iminoxyl radical is described. The conjugation proceeded with high Tyr-selectivity and short reaction time under biocompatible conditions (room temperature in buffered media under air). The stability of the conjugates was tunable depending on the steric hindrance of iminoxyl. The presence of sodium ascorbate and/or light irradiation promoted traceless deconjugation, restoring the native Tyr structure. The method is applied to the synthesis of a protein-dye conjugate and further derivatization to azobenzene-modified peptides.

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