Halogen-bonded iodonium ion catalysis: a route to α-hydroxy ketones via domino oxidations of secondary alcohols and aliphatic C–H bonds with high selectivity and control

2017 ◽  
Vol 53 (79) ◽  
pp. 10942-10945 ◽  
Author(s):  
Somraj Guha ◽  
Imran Kazi ◽  
Pranamita Mukherjee ◽  
Govindasamy Sekar
Keyword(s):  
High Selectivity ◽  
Oxidation Process ◽  
Secondary Alcohols ◽  
Benzylic Alcohols ◽  
Hydroxy Ketones ◽  
And Control

Halogen-bonded iodonium ions have been employed as selective oxidants in a challenging domino oxidation process to form synthetically important α-hydroxy ketones from easily available benzylic alcohols.

Control of Metal Alloy Oxidation with Electric Fields

1973 ◽  
Vol 31 ◽  
pp. 164-165
Author(s):  
R. R. Dils ◽  
P. S. Follansbee
Keyword(s):  
Electric Fields ◽  
Oxidation Process ◽  
Base Alloy ◽  
Oxide Surface ◽  
Platinum Electrodes ◽  
Insulating Layer ◽  
Iron Base Alloy ◽  
Alloy Oxidation ◽  
Aluminum Oxide Layer ◽  
And Control

Electric fields have been applied across oxides growing on a high temperature alloy and control of the oxidation of the material has been demonstrated. At present, three-fold increases in the oxidation rate have been measured in accelerating fields and the oxidation process has been completely stopped in a retarding field.The experiments have been conducted with an iron-base alloy, Pe 25Cr 5A1 0.1Y, although, in principle, any alloy capable of forming an adherent aluminum oxide layer during oxidation can be used. A specimen is polished and oxidized to produce a thin, uniform insulating layer on one surface. Three platinum electrodes are sputtered on the oxide surface and the specimen is reoxidized.

Bonding, Defects, And Defect Dynamics In The Sic-SiO2 System

2000 ◽  
Vol 640 ◽  
Author(s):  
S. T. Pantelides ◽  
R. Buczko ◽  
M. Di Ventra ◽  
S. Wang ◽  
S.-G. Kim ◽  
...  
Keyword(s):  
First Principles ◽  
Oxidation Process ◽  
Atomic Scale ◽  
Contrast Imaging ◽  
Interface Defects ◽  
Device Applications ◽  
Z Contrast ◽  
And Control ◽  
Electron Energy Loss ◽  
Ultimate Purpose

ABSTRACTThis paper presents a review of new results obtained by a combination of first-principles theory, Z-contrast imaging, and electron-energy-loss spectroscopy in the context of a broader experimental/theoretical program to understand and control the atomic-scale structure of SiCSiO2 interfaces. The ultimate purpose is to achieve low interface trap densities for device applications. Results are given for global bonding arrangements in comparison with those of the Si-SiO2 interface, the mechanism of the oxidation process, the nature of possible interface defects and their passivation by N and H, and the formation and dissolution of C clusters in SiO2 during oxidation and reoxidation.

Studies on the Immobilized-Lipase-Catalyzed Esterification of Alkyl Oleates in Solvent-Free Systems

2013 ◽  
Vol 645 ◽  
pp. 19-23 ◽  
Author(s):  
Hui Zhong ◽  
Zheng Fang ◽  
Bao Hua Zou ◽  
Xin Li ◽  
Kai Guo
Keyword(s):  
Oleic Acid ◽  
Low Temperature ◽  
High Selectivity ◽  
Immobilized Lipase ◽  
Enzyme Concentration ◽  
Molar Ratio ◽  
High Yield ◽  
Secondary Alcohols ◽  
Tertiary Alcohols ◽  
Candida Sp

The esterification of oleic acid with alkyl alcohols in solv ent-free systems was catalyzed by an immobilized lipase from Candida sp . 99-125. The influence of several factors, including enzyme concentration, temperature, molar ratio between oleic acid and alkyl alcohols, and structure of alcohol was also investigated. The results indicated that the reactions catalyzed by lipase at 20 o C, in the presence of 3% (w/w) lipase, on the molar ratio of 1:1 between oleic acid and alcohols, afforded products in high yield. It showed high selectivity to primary and low selectivity to secondary alcohols and tertiary alcohols because of the sterically hindered effect. Methanol has certain toxicity on the activity of the lipase. The lipase from Candida sp. 99-125 was identified to be an effective catalyst in the esterification of alcohol and oleic acid at low temperature.

scholarly journals Sodium Copper Chlorophyllin Catalyzed Chemoselective Oxidation of Benzylic Alcohols and Diarylmethanes in Water

Molecules ◽  
2018 ◽  
Vol 23 (8) ◽  
pp. 1883 ◽  
Author(s):  
Shi-juan Liu ◽  
Miao Zhang ◽  
Rong Lu ◽  
Xiu-ying Li ◽  
Guang-bo Che
Keyword(s):  
Catalytic System ◽  
Functional Group ◽  
Secondary Alcohols ◽  
Benzylic Alcohols ◽  
Highly Efficient ◽  
Aryl Ketones ◽  
Sodium Copper Chlorophyllin

We report the highly efficient and chemoselective oxidation of benzylic alcohols catalyzed by sodium copper chlorophyllin in water, producing corresponding arylcarbonyl compounds. Importantly, the catalytic system exhibits a wide substrate scope and high functional group tolerance. Moreover, secondary alcohols and even diarylmethanes were smoothly oxidized to the desired aryl ketones with excellent yields.

Effects of NaCl and KCl on Growth and Ionic Composition of the Halophytic C4 Succulent Chenopods Salsola kali, Suaeda monoica and Suaeda aegyptiaca

1985 ◽  
Vol 12 (3) ◽  
pp. 319 ◽  
Author(s):  
A Eshel
Keyword(s):  
High Selectivity ◽  
Ionic Composition ◽  
Sand Culture ◽  
Fresh Weight ◽  
Sodium Deficiency ◽  
Salsola Kali ◽  
Inorganic Ion ◽  
Half Strength ◽  
And Control ◽  
Chloride Salts

Salsola kali, Suaeda monoica and Suaeda aegyptiaca plants were grown in sand culture under controlled conditions and treated with half-strength Hoagland's nutrient solution (control), and control plus 150 mol m-3 KCl or NaCl. Fresh weight of Salsola kali was doubled in the NaCl and KCl treatments, but the increase in dry matter as compared with the control was not significant. Ionic content in this species revealed high selectivity for K v. Na. Fresh weight of Suaeda monoica and S. aegyptiaca was raised by NaCl 5 and 10 times respectively. Control and KCl-treated plants were poorly developed and plants of S. aegyptiaca exhibited sodium deficiency symptoms under these treatments. The two Suaeda species had lower selectivity of K v. Na than Salsola kali. Of the two annual species, Suaeda kali and S. aegyptiaca, S. kali flowered under all three treatments, whereas S. aegyptiaca flowered only under the Na treatment. In spite of the fact that all three species are inorganic ion accumulators and C4-succulent chenopods, they exhibit wide differences in their response to the two chloride salts.

Design and control of a p-xylene oxidation process

2015 ◽  
Vol 23 (12) ◽  
pp. 1935-1944 ◽  
Author(s):  
Lili Tao ◽  
Zhihua Hu ◽  
Feng Qian
Keyword(s):  
Oxidation Process ◽  
And Control
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