Oxidative methylation

A number of other gases can undergo reactions that produce decomposition flames—for instance, ethylene, ethylene oxide, methyl nitrate, ethyl nitrate, and hydrazine (CCPS 1993). 

A-Methylation occurs when 78 is treated with dimethyl sulfate or diazomethane, but reaction with silver oxide-methyl iodide gives a... 

The reaction of 78 with phosphorus pentasulfide in xylene gives the corresponding 2-oxazolethione, which also forms the iV -methyl product with dimethyl sulfate and 4,5-diphenyl-2-methyhnercapto-oxazole in 98% yield on treatment with silver oxide-methyl iodide. 

Komori and Nonaka132,133 electrochemically oxidized methyl, isopropyl, n-butyl, isobutyl, r-butyl and cyclohexyl phenyl sulfides (108) and cyclohexyl p-tolyl sulfide (109) to their sulfoxides using a variety of polyamino acid-coated electrodes to obtain the range of e.e. values shown in parentheses. The highest enantiomeric purities were obtained using an electrode doubly coated with polypyrrole and poly(L-valine), an electrode which also proved the most durable of those prepared. 

The standard Sharpless reagent [Ti(OPr-i)4/(R, R)-diethyl tartrate (DET)/t-BuOOH] oxidizes methyl p-tolyl sulphide into a mixture of racemic sulphoxide and sulphone286. 

Methyl 5-quinoxalinecarboxylate Methyl 6-quinoxalinecarboxylate Methyl 2-quinoxalinecarboxylate 1-oxide Methyl 2-quinoxalinecarboxylate 4-oxide 3-Methyl-2-quinoxalinecarboxylic acid... 

Methyl 5-methoxy-6,7-dimethyl-3-oxo-3,4-dihydro-2-quinoxalinecarboxylate Methyl 5-methoxy-6,7-dimethyl-3-oxo-3,4-dihydro-2-quinoxalinecarboxylate 1 -oxide Methyl 3-methoxy-2-quinoxalinecarboxylate 2-Methy l-3-( 1 -methylallyl)quinoxaline 2-Methyl-3-(2-methylallyl)quinoxaline 2-Methyl-3-methylaminomethylquinoxaline 5-Methyl-7-methylamino-8-nitro-2-phenylquinoxaline 5-Methyl-7-methylamino-8-nitro-3-phenylquinoxaline... 

Methyl-3-oxo-3,4-dihydro-2-quinoxalinecarboxamide 1-oxide Methyl 3-oxo-3,4-dihydro-2-quinoxalonecarboxylate... 

The structure of narlumidine (119) was established by Dasgupta et al. (117,119) on the basis of spectral data, particularly by comparison with spectra of bicucullinine (108), and also on chemical grounds. On hydrolysis followed by oxidation-methylation, narlumidine (119) was converted to ester 147, which was also obtained from 108 by N.O-methylation. Sodium borohydride reduction gave lactone 145, identical to the lactone obtained from 108. 

By using a combination of RAFT and ring opening polymerization (ROP), (polyethylene oxide) methyl ether)(polystyrene)(poly(L-lactide) 3-miktoarm star terpolymers have been successfully synthesized [182]. The synthetic approach involved the reaction of the cw-functionalized - OH group of the poly(ethylene oxide) methyl ether with maleic anhydride under conditions where only one hydroxyl group can be esterified (MPEO). The double bond... 

Run no. pH Conv. (mol%) Styrene oxide Methylated diol Diol Benzaldehyde Phenyl acetaldehyde Others... 

Of several procedures for the stereoselective oxidation of sulfides using organometallic complexes, two adaptations of Kagan s original process have gained prominence. In the first method the diol (36) is reacted with Ti(0 Pr)4 to form the catalyst. With cumyl hydroperoxide as the stoichiometric oxidant, methyl para-tolyl sulfide was converted into the optically active sulfoxide in 42 % yield (98 % ee)[109]. 

Methyl-3-penten-2-one. See Mesityl oxide Methyl-4-(phenylthio)phenyl sulfoxide,... 

Rasche et al. [410] reported that some terrestrial and marine nitrifiers had the capacity to oxidize methyl bromide to formaldehyde and bromide ion. They concluded that ammonia monooxygenase produced by the nitrifiers, which catalyzes the oxidation of ammonia to hydroxylamine, was responsible for the oxidation of methyl bromide to formaldehyde. 

Oremland et al. [136] subsequently demonstrated that methane-oxidizing bacteria also had the capacity to co-oxidize methyl bromide by methane monooxygenase produced during the oxidation of methane to methanol. They also showed that methanotrophic soils that had a high capacity to oxidize methane degraded14C-labeled methyl bromide to 14C02. 

Methyloctane. see 4-Methyloctane Methylol. see Methanol Methylolpropane. see 1 -Butanol Methyloxirane. see Propylene oxide Methyl oxitol, see Methyl cellosolve 4-Methyl-2-pentanol acetate, see sec-Hexyl acetate 2-Methyl-2-pentanol-4-one, see Diacetone alcohol... 

Synonyms Methanal formic aldehyde oxomethane oxymethylene methylene oxide methyl aldehyde... 

Because BaO/NaX zeolite catalysts exhibited the best performance, further investigations have been carried out recently to characterize the oxidative methylation of toluene catalyzed by BaO-modified X- and Y-zeolites, mordenite, ZSM-5, sil-icalite, and ALPO4-5 (230). The authors found that activity and basicity of BaO-modified zeolites and zeolite-like catalysts depend on both the structural type and composition. Thus, for samples of the same structural type (BaO/NaX zeolite. 

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