A Novel Organic Electron Donor Derived from N-Methylisatin

2013 ◽  
Vol 66 (3) ◽  
pp. 314 ◽  
Author(s):  
Ryan Sword ◽  
Steven O'Sullivan ◽  
John A. Murphy
Keyword(s):  
Electron Donor ◽  
Weinreb Amides ◽  
Sodium Amalgam ◽  
Organic Electron ◽  
Electron Reduction ◽  
Supernatant Solution ◽  
Clear Supernatant

We report the reactivity of an electron donor derived from N-methylisatin on reduction by sodium amalgam. Transfer of a clear supernatant solution to iodoarenes affords the products of two-electron reduction. Reductions of sulfones, activated arenesulfonamides, and Weinreb amides are also reported.

scholarly journals A composite photocatalyst of an organic electron donor–acceptor dyad and a Pt catalyst supported on semiconductor nanosheets for efficient hydrogen evolution from oxalic acid

2015 ◽  
Vol 5 (1) ◽  
pp. 428-437 ◽  
Author(s):  
Yusuke Yamada ◽  
Akifumi Nomura ◽  
Hideyuki Tadokoro ◽  
Shunichi Fukuzumi
Keyword(s):  
Oxalic Acid ◽  
Hydrogen Evolution ◽  
Electron Donor ◽  
Pt Catalyst ◽  
Composite Photocatalyst ◽  
Organic Electron ◽  
Donor Acceptor

A Pt catalyst was closely located to an organic photosensitiser on a negatively charged semiconductor for efficient photocatalytic H2 evolution.

THE OXIDATION OF SUCCINATE IN EXTRACTS OF XANTHOMONAS PHASEOLI

1960 ◽  
Vol 38 (1) ◽  
pp. 481-492
Author(s):  
N. B. Madsen
Keyword(s):  
Electron Transport ◽  
Electron Transport Chain ◽  
Intact Cell ◽  
Succinic Dehydrogenase ◽  
Order Reaction ◽  
First Order ◽  
Transport Chain ◽  
Particulate Form ◽  
Supernatant Solution ◽  
Clear Supernatant

Succinoxidase and succinic dehydrogenase were found in cell-free extracts of Xanthomonas phaseoli, obtained by sonic oscillation, and remained largely in the supernatant solution after ultracentrifugation. The effect of time of exposure of the cells to sonic oscillation on cell breakage was found to follow first order reaction kinetics, as was the "solubilization" of succinic dehydrogenase and succinoxidase. It appears that the two enzymatic activities are released from the cell in a particulate form which is further fragmented on continued treatment in the sonic oscillator.The clear supernatant solution obtained after ultracentrifugation of the cell-free extract was found to contain those members of the electron transport chain which had previously been found in the intact cell, namely, flavoprotein and cytochromes b1, a1, and a2. These substances could be reduced by the addition of succinate. Malonate prevented this reduction. The effects of various inhibitors on the succinoxidase system and on succinic dehydrogenase are presented and discussed in relation to the operation of the electron transport chain in the oxidation of succinate by this organism.

ChemInform Abstract: Metal-Free Reductive Cleavage of N-O Bonds in Weinreb Amides by an Organic Neutral Super-Electron Donor.

ChemInform ◽  
2008 ◽  
Vol 39 (52) ◽  
Author(s):  
Sylvain P. Y. Cutulic ◽  
John A. Murphy ◽  
Hardeep Farwaha ◽  
Sheng-Ze Zhou ◽  
Ewan Chrystal
Keyword(s):  
Electron Donor ◽  
Reductive Cleavage ◽  
Metal Free ◽  
Weinreb Amides

Highly Efficient Reduction of Unactivated Aryl and Alkyl Iodides by a Ground-State Neutral Organic Electron Donor

2005 ◽  
Vol 44 (9) ◽  
pp. 1356-1360 ◽  
Author(s):  
John A. Murphy ◽  
Tanweer A. Khan ◽  
Sheng-ze Zhou ◽  
Douglas W. Thomson ◽  
Mohan Mahesh
Keyword(s):  
Electron Donor ◽  
Ground State ◽  
Highly Efficient ◽  
Efficient Reduction ◽  
Organic Electron ◽  
Alkyl Iodides

Electron Transfer to Benzenes by Photoactivated Neutral Organic Electron Donor Molecules

2012 ◽  
Vol 51 (15) ◽  
pp. 3673-3676 ◽  
Author(s):  
Elise Cahard ◽  
Franziska Schoenebeck ◽  
Jean Garnier ◽  
Sylvain P. Y. Cutulic ◽  
Shengze Zhou ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Electron Donor ◽  
Organic Electron

scholarly journals On the atomic weight of strontium

1910 ◽  
Vol 83 (562) ◽  
pp. 277-289 ◽  
Keyword(s):  
Silver Chloride ◽  
Atomic Weight ◽  
Great Accuracy ◽  
Silver Bromide ◽  
High Degree ◽  
Supernatant Solution ◽  
Clear Supernatant

In the Bakerian Lecture for 1907, “On the Atomic Weight of Radium,” one of us described a rapid and effective method of separating the clear supernatant solution above a precipitate, say of silver chloride or silver bromide, which obviated the necessity of employing any of the ordinary methods of filtration and otherwise greatly simplified the manipulative process. As the contrivance was found convenient in practice and seemed to admit of a high degree of accuracy, we have thought it worth while to make use of it in a redetermination of the atomic weight of strontium which should seek to conform to the standard of precision prescribed by modern procedure in atomic weight estimations. Determinations of the atomic weight of strontium have been made by Stromeyer (1816), Rose (1816), Salvétat (1843), Pelouze (1845), Marignac (1858), Dumas (1859), and Richards (1894-5 and 1905). With the exception of those of Richards these estimations have no claim to great accuracy, and are therefore only of historical interest.

"High-pressure" liquid chromatography of sulfisoxazole and N4-acetylsulfisoxazole in body fluids.

1980 ◽  
Vol 26 (1) ◽  
pp. 51-54
Author(s):  
D Jung ◽  
S Oie
Keyword(s):  
Internal Standard ◽  
Peak Height ◽  
Absolute Methanol ◽  
Peak Height Ratio ◽  
Pharmacokinetic Studies ◽  
Height Ratio ◽  
Calculated Concentration ◽  
Supernatant Solution ◽  
Clinical Drug ◽  
Clear Supernatant

Abstract We describe a simple, rapid chromatographic method for separating and quantitatively determining sulfisoxazole and its N4-acetyl metabolite in plasma and urine. A 100-micro L sample of plasma or urine is combined with 200 micro L of a solution containing 12 mg/L of the internal standard, N4-acetylsulfamethoxazole, in absolute methanol and centrifuged to obtain a clear supernatant solution. This solution is then eluted through a 10-micron microparticulate column with a mobile phase of 32/68 (by vol) methanol/sodium acetate buffer (0.01 mol/L, pH 4.7), at a flow rate of 1.2 mL/min. The eluted sompounds are detected by their absorption at 254 nm. We calculated concentration from the peak-height ratios of sulfisoxazole or N4-acetylsulfisoxazole to N4-acetylsulfamethoxazole. The peak-height ratio was linear with concentration in the range 0.05--200 mg/L for both drug and metabolite in plasma and urine. Because this assay can be completed within 30 min of obtaining a blood or urine sample, it should be a valuable tool in clinical drug monitoring and pharmacokinetic studies.

Reactivity of Electron-Donor—Acceptor Complexes. III. Hydrogen Exchange between Acetylene and Organic Electron-Donor—Acceptor Complexes

1966 ◽  
Vol 70 (9) ◽  
pp. 3020-3021 ◽  
Author(s):  
Masaru Ichikawa ◽  
Mitsuyuki Soma ◽  
Takaharu Onishi ◽  
Kenzi Tamaru
Keyword(s):  
Electron Donor ◽  
Hydrogen Exchange ◽  
Organic Electron ◽  
Donor Acceptor

Rubbone

1935 ◽  
Vol 8 (4) ◽  
pp. 624-626
Author(s):  
H. P. Stevens ◽  
W. H. Stevens
Keyword(s):  
Linseed Oil ◽  
Standard Procedure ◽  
White Spirit ◽  
Physical Change ◽  
Cent Solution ◽  
Vulcanized Rubber ◽  
Reduced Viscosity ◽  
Different Types ◽  
Supernatant Solution ◽  
Clear Supernatant

Abstract Of all the reactions which natural rubber undergoes, oxidation next to vulcanization, may be said to rank in the first place. For not only does the life and usefulness of all raw and vulcanized rubber depend on the course of this reaction, but attempts to create useful oxides may be regarded as based on the same reaction. It has already been shown that, by the catalytic oxidation of rubber, solutions of greatly reduced viscosity and/or increased concentration are obtainable. Thus, a 50 per cent solution of rubber which will flow at normal temperatures can be made by incorporating 2.5 per cent of cobalt linoleate on the mill, subsequently “letting down” in white spirit or other solvent by means of an internal type of mixer. The mechanism of the oxidation of rubber is a complex and still incompletely solved problem, but a reasonably acceptable explanation of this reduction in viscosity is that it is due to a disaggregation of the rubber micelle, whereby a very small amount of chemically combined oxygen is enabled to effect a very large physical change in the character of the colloid. This change is promoted by catalysts, such as the ordinary paint driers, and there appears to exist an analogy between the drying of paint and the disaggregation of rubber solutions, but it is interesting to note that whereas copper soaps have substantially no effect on the drying of linseed oil, they do reduce the viscosity of rubber solutions appreciably. Solutions of rubber containing catalysts have been “blown” by bubbling air, oxygen or ozonized air through them while maintained at raised temperatures by suitable means. The experiments covered a great variety of conditions, including different solvents, different types and concentrations of rubber and catalyst, mixed catalysts and a variety of temperatures and blowing conditions. It was found that under suitable conditions the oxidation of the rubber could be taken to a stage where the cobalt linoleate itself became oxidized and was precipitated from the solution. After filtering, the resulting solutions were evaporated to yield an oxidized rubber resin. A standard procedure has been developed for the production of this rubber resin, or “Rubbone” as it is conveniently termed, as follows. A solution of milled blanket crepe in white spirit is made by dissolving 20 parts by weight of rubber in 80 parts by weight of solvent, adding 0.5 part of cobalt linoleate, and aerating at 80°C. until a sample drawn off from the bulk shows a quick separation of sediment and a clear supernatant solution of the resin. The solution is clarified by “tanking” or centrifuging and is then distilled by steam or in vacuo to separate the resin.

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