نتایج جستجو برای: Mild oxidizing agents
تعداد نتایج: 480183 فیلتر نتایج به سال:
Zinc chlorochromate nonahydrate is easily prepared from the aqueous solution of chromium trioxide and zinc chloride in quantitative yield. This oxidant, in methylene chloride and at room temperature, oxidizes thiols to their disulfides. Acetals and thioacetals are deprotected to their corresponding carbonyl compounds. Sulfides are selectively converted to ther sulfoxides or sulfones. Arylox...
heteropoly acids (hpa) and their salts have advantages as catalysts which make them both economically and environmentally attractive, strong br?nsted acidity, exhibiting fast reversible multi-electron redox transformations under rather mild conditions, very high solubility in polar solvents, fairly high thermal stability in the solid states, and efficient oxidizing ability, so that they are imp...
The protein component of a number of enzyme systems contains SH groups which are either freely reacting or sluggish. The freely reacting SH groups give the nitroprusside test in the native protein, are easily oxidized by mild oxidizing agents and alkylating agents in low concentrations (iodoacetate,mustardgas, diphosgene, cyanogenchloride), and readily form mercaptides. On denaturation, the slu...
abstract in first part of this project, the use of a new and biguanid-like catalyst supported on silica as a recyclable catalyst provides a new route for the synthesis of a variety of arylalkylidene rhodanine derivatives through knoevenagle reaction in at present of solvent at room temperature. rhodanine derivatives and especially arylalkylidene rhodanines have proven to be attractive compound...
Oxidation of different types of 1,4-dihydropyridines with diphenylpicrylhydrazyl (DPP) and benzoyl peroxide (Bz2O2) as free radical oxidizing agents to pyridine derivatives is reported and a mechanism for this oxidation is also proposed.
Many components of cellular signaling pathways are sensitive to regulation by oxidation and reduction. Previously, we described the inactivation of cAMP dependent protein kinase (PKA) by direct oxidation of a reactive cysteine in the activation loop of the kinase. In the present study, we demonstrate that in Hela cells PKA activity follows a biphasic response to thiol oxidation. Under mild oxid...
oxidation of different types of 1,4-dihydropyridines with diphenylpicrylhydrazyl (dpp) and benzoyl peroxide (bz2o2) as free radical oxidizing agents to pyridine derivatives is reported and a mechanism for this oxidation is also proposed.
Since the inception of the drug-testing program in the U.S. Armed Forces in 1982, urine adulteration with the intent to conceal drug use has been a serious problem to forensic scientists. Initially, drug users tried almost anything that was available at the collection sites. Soon they recognized that certain chemicals could be used to destroy some drugs and interfere with the testing procedures...
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