Bi-aryl rotation in phenyl-dihydroimidazoquinoline catalysts for kinetic resolution of arylalkyl carbinols

2014 ◽  
Vol 4 (7) ◽  
pp. 1909-1913 ◽  
Author(s):  
Zheng Wang ◽  
Jinjin Ye ◽  
Rui Wu ◽  
Yang-Zi Liu ◽  
John S. Fossey ◽  
...  
Keyword(s):  
Kinetic Resolution ◽  
High Selectivity ◽  
Very High ◽  
Nucleophilic Catalysts

Chiral nucleophilic catalysts, 6-aryl-phenyl-dihydroimidazoquinolines (PIQs), were designed, synthesised and applied to the kinetic resolution of arylalkyl carbinols with very high selectivity (S) factors (up to 530).

scholarly journals Kinetic Resolution of Racemic 2-Hydroxyamides Using a Diphenylacetyl Component as an Acyl Source and a Chiral Acyl-Transfer Catalyst

Molecules ◽  
2018 ◽  
Vol 23 (8) ◽  
pp. 2003 ◽  
Author(s):  
Takatsugu Murata ◽  
Tatsuya Kawanishi ◽  
Akihiro Sekiguchi ◽  
Ryo Ishikawa ◽  
Keisuke Ono ◽  
...  
Keyword(s):  
Kinetic Resolution ◽  
High Selectivity ◽  
Optically Active ◽  
Acyl Transfer ◽  
Chiral Compounds ◽  
Tertiary Amide

Various optically active 2-hydroxyamide derivatives are produced based on the kinetic resolution of racemic 2-hydroxyamides with a diphenylacetyl component and (R)-benzotetramisole ((R)-BTM), a chiral acyl-transfer catalyst, via asymmetric esterification and acylation. It was revealed that a tertiary amide can be used with this novel protocol to achieve high selectivity (22 examples; s-value reaching over 250). The resulting chiral compounds could be transformed into other useful structures while maintaining their chirality.

Synthesis of CuxNi(1−x)O coral-like nanostructures and their application in the design of a reusable toxic heavy metal ion sensor based on an adsorption-mediated electrochemical technique

2017 ◽  
Vol 4 (1) ◽  
pp. 191-202 ◽  
Author(s):  
Sayan Dey ◽  
Sumita Santra ◽  
Anupam Midya ◽  
Prasanta Kumar Guha ◽  
Samit Kumar Ray
Keyword(s):  
Heavy Metal ◽  
Detection Limit ◽  
Metal Ion ◽  
High Selectivity ◽  
Heavy Metal Ion ◽  
Electrochemical Technique ◽  
Toxic Heavy Metal ◽  
Ion Sensors ◽  
Metal Ion Sensors ◽  
Very High

Nanostructured, Cu-doped nickel oxides serve as excellent, ultra-fast, re-usable heavy metal ion sensors with an ultra-low detection limit and very high selectivity towards toxic Cr(vi) ions.

Kinetics of ο-Chloronitrobenzene Hydrogenation on Palladium/Carbon Catalyst

2011 ◽  
Vol 239-242 ◽  
pp. 161-167
Author(s):  
Xiao Zhen Wang ◽  
Yi Feng Zhu ◽  
Xiao Nian Li
Keyword(s):  
High Selectivity ◽  
Total Yield ◽  
Hydrogenation Reaction ◽  
Commercial Application ◽  
Reaction Conditions ◽  
Solvent Free Conditions ◽  
Hydrogenation Kinetics ◽  
Favorable Reaction ◽  
Kinetics Of ◽  
Very High

A 2 wt % Pd/C catalyst has been prepared by chemical impregnation and used to catalyze the hydrogenation of o-chloronitrobenzene (o-CNB) to o-chloroaniline (o-CAN) in solvent-free conditions. The effects of reaction temperature, H2 pressure, and stirring intensity on the hydrogenation kinetics have been investigated. The hydrogenation reaction showed very high selectivity with dehalogenation side products as low as 0.3% of total yield. The favorable reaction conditions were found to be temperature T = 383 K, stirring speed = 900 rpm, and feeding ratio CNB/catalyst = 200/1 (m/m). The recycled Pd/C still retained more than 98% of its original selectivity after 12 repeat used, indicating the catalyst had strong potentials for commercial application at industrial scale.

Kinetics of 2-Chloro-6-Nitrotoluene Hydrogenation on Palladium/Carbon Catalyst without Inhibitors

2012 ◽  
Vol 487 ◽  
pp. 107-110
Author(s):  
Feng Wen ◽  
Yi Feng Zhu ◽  
Xiao Nian Li
Keyword(s):  
Activation Energy ◽  
High Selectivity ◽  
Hydrogenation Reaction ◽  
Zero Order ◽  
Carbon Catalyst ◽  
Free Condition ◽  
Solvent Free Condition ◽  
Favorable Conditions ◽  
Kinetics Of ◽  
Very High

Pd-only catalyst supported on activated carbon has been prepared by chemical impregnation and used to catalyze the hydrogenation of 2-chloro-6-nitrotoluene (2-CNT) to 3-chloro-2-methylaniline in solvent-free condition. The effects of reaction temperature，H2 pressure on the hydrogenation have been investigated. The reaction showed very high selectivity with the dehalogenation side product with a yield of less than 1.2 %. The most favorable conditions could be temperature= 353 K, stirring speed= 1200 rpm, H2 pressure= 1 MPa. The catalytic hydrogenation reaction was found to have a zero order with hydrogen and 1 order with 2-CNT. The apparent activation energy of the hydrogenation was 60.58 kJ/mol.

PURIFICATION OF LYSOZYME BY INTRINSICALLY SHIELDED HYDROGEL BEADS

2013 ◽  
Vol 27 (19) ◽  
pp. 1341028
Author(s):  
CONG LI ◽  
R. ZHANG ◽  
L. WANG ◽  
A. BOWYER ◽  
R. EISENTHAL ◽  
...  
Keyword(s):  
Binary Mixture ◽  
High Purity ◽  
High Selectivity ◽  
Egg White ◽  
Titration Calorimetry ◽  
Binding Affinities ◽  
Affinity Separation ◽  
Hydrogel Beads ◽  
Relative Binding ◽  
Very High

Macro-sized intrinsically shielded hydrogel beads have been prepared from BSA and CM-dextran grafted with CB using a technique based on freeze-thawing gelation method. The size of the beads lies in around 500 μm. Isothemal titration calorimetry (ITC) showed that the relative binding affinities of the lysozyme for CB, compared with BSA, at pH 3.0 was stronger than that at pH 7.4. They were employed for the affinity separation of lysozyme using chromatography column. Their adsorption capacity for lysozyme at pH 3.0 is higher than that at pH 9. In a binary mixture of lysozyme and ovalbumin, the beads showed very high selectivity toward lysozyme. Lysozyme of very high purity (> 93%) was obtained from a mixture of lysozyme and ovalbumin, and 85% from egg white solution. The results indicate that the macro-sized bead can be used for the separation, purification, and recovery of lysozyme in a chromatograph column.

scholarly journals A Z-scheme photocatalyst constructed with an yttrium–tantalum oxynitride and a binuclear Ru(ii) complex for visible-light CO2 reduction

2016 ◽  
Vol 52 (50) ◽  
pp. 7886-7889 ◽  
Author(s):  
Kanemichi Muraoka ◽  
Hiromu Kumagai ◽  
Miharu Eguchi ◽  
Osamu Ishitani ◽  
Kazuhiko Maeda
Keyword(s):  
Visible Light ◽  
Band Gap ◽  
High Selectivity ◽  
Co2 Reduction ◽  
Very High ◽  
Hybrid Photocatalyst

A hybrid photocatalyst composed of an yttrium–tantalum oxynitride (with a 2.1 eV band gap) and a binuclear Ru(ii) complex containing both photosensitizing and catalytic units was capable of reducing CO2 to HCOOH with very high selectivity (>99%) under visible light (>400 nm) irradiation.

Design of the Compact Parallel Coupled Wideband Bandpass Filter With Very High Selectivity and Wide Stopband

2007 ◽  
Vol 17 (7) ◽  
pp. 510-512 ◽  
Author(s):  
Cheng-Yuan Hung ◽  
Min-Hang Weng ◽  
Ru-Yuan Yang ◽  
Yan-Kuin Su
Keyword(s):  
High Selectivity ◽  
Bandpass Filter ◽  
Very High

scholarly journals Preparation of CoOx/magenium silicate for the liquid oxidation of benzyl alcohol

2020 ◽  
Vol 9 (4) ◽  
Author(s):  
Nhu Nguyen Thi ◽  
Mai Tran Thi Ngoc ◽  
Khanh Pham Quoc ◽  
Tuan Vu Anh ◽  
Thao Nguyen Tien
Keyword(s):  
Benzyl Alcohol ◽  
Selective Oxidation ◽  
High Selectivity ◽  
Magnesium Silicate ◽  
Oxidizing Agent ◽  
Oxidation Of Benzyl Alcohol ◽  
Tert Butyl Hydroperoxide ◽  
Calcination Method ◽  
Alcohol Conversion ◽  
Very High

CoOx/magenium silicate catalysts are obtained though precipitation and calcination method. The prepared solids were analyzed by XRD, BET, EDS... Cobalt(II) ions supported-magnesium silicate catalysts expressed as effective catalysts for selective oxidation of benzyl alcohol using tert-butyl hydroperoxide as an oxidizing agent. The experimental results  showed very high selectivity to the benzaldehyde product at benzyl alcohol conversion of 18-25%.

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