Substrates and oxidation agents

Oxidation of 7-hydroxy- and 7-aryl-5-oxo-2,3-dihydro-5//-pyrido[l,2,3- f< ]-l,4-benzothiazine-6-carboxylates and 6-carboxamides with 3-chloroper-oxybenzoic acid in CH2CI2 yielded sulfoxides and sulfones, depending on the molar ratio of the substrate and oxidizing agent (00MIP7). A sulfoxide was prepared by the oxidation of ethyl (3S)-3-methyl-10-(2,6-dimethyl-4-pyridyl)-7-oxo-2,3-dihydro-7//-pyrido[l,2,3-<7c]-l,4-benzothiazine-6-carbox-ylate (OOMIPIO). 

An equimolar ratio of a substrate and oxidizing agent gives oxides 23 and 24 in yields of 71% and 4%, respectively, whereas triple the amount of oxidizing agent leads only to dioxide 24 in 93% yield. The intermediate naphtho[nitrogen elimination even at room temperature. Dioxide 24 may be obtained only on oxidation of monoxide 23, and not via the formation of... 

Prospective Substrates and Oxidation Agents Acceptorless Dehydrogenative Oxidations Oxidative Desymmetrizations... 

In pyridine/water solution, the system making use of [Mn VMe(piperidine) Br] % sodium borohydride, and O2 produced a very small amount of cyclohexene oxide from cyclohexene. Similar systems involving different solvents, substrates and reducing agents failed to give evidence for autoxidation. The addition of acyl halides and acetic anhydride to these solutions in an effort to facilitate 0-0 bond cleavage by acylation also failed to produce detectable concentrations of products. ... 

Polyaniline salts may also be deposited by in situ adsorption polymerization" in a few minutes, as strongly adhering films on a variety of substrates/ such as natural and synthetic fibers and textiles,8 plastic, glass, silver chloride pellets etc.,9 by immersing the substrate in a freshly mixed acidic aqueous solution of aniline and oxidizing agent, such as ammonium peroxydisulfate. It is believed that a reactive intermediate, possibly an oligomeric radical cation of aniline, is first adsorbed, which subsequently polymerizes.8... 

N—Fe(IV)Por complexes. Oxo iron(IV) porphyrin cation radical complexes, [O—Fe(IV)Por ], are important intermediates in oxygen atom transfer reactions. Compound I of the enzymes catalase and peroxidase have this formulation, as does the active intermediate in the catalytic cycle of cytochrome P Q. Similar intermediates are invoked in the extensively investigated hydroxylations and epoxidations of hydrocarbon substrates cataly2ed by iron porphyrins in the presence of such oxidizing agents as iodosylbenzene, NaOCl, peroxides, and air. 

Chemical Vapor Deposition. In chemical vapor deposition (CVD), often referred to as vapor transport, the desired constituent(s) to be deposited are ia the form of a compound existing as a vapor at an appropriate temperature. This vapor decomposes with or without a reducing or oxidizing agent at the substrate— vapor interface for film growth. CVD has been used successfully for preparing garnet and ortho ferrite films (24,25). Laser-assisted CVD is also practiced. 

Cross-linked finishes are not permanent in the tme sense of the word however, under optimum conditions the finish can last for the usehil life of the material. Wet abrasion during laundering is probably the principal cause of gradual removal of the finish. In order to retain antistatic protection for extended use, an excess of finish is often appHed The extent of chemical interaction between the durable antistatic agents and the fiber substrates to which they are appHed is not perfectiy understood. Certain oxidizing agents such as hypochlorite bleaches tend to depolymerize and remove some durable antistatic finishes. Some of the durable finishes have also produced undesirable side effects on textile materials, ie, harsh hand, discoloration, and loss of tensile properties. 

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