Methyl sulphite

Methyl -propyl ketone, 340 Methyl pyridines, purification of, 177-179 N-Methylpyrrole, 837, 838 Methyl red, 621, 625 sodium salt of, 626 Methyl salicylate, 780,782 Methyl sulphite, 304 2-Methylthiophene, 836 Methyl p-toluenesulphonate, 825 Methylurea, 968, 969 Methylene bromide, 300 Methylene chloride, purification of, 176 3 4-Methylenedioxycinnamic acid, 711, 719... 

Interestingly, use of methyl sulphite leads to the methanesulphonate of the methylated amine, A recently reported method, considered to be suitable for alcohols capable of yielding fairly stable carbonium ions, involves thermolysis of the corresponding dimethylsulphamate, followed by hydrolysis (reaction 31). The method may prove a useful... 

The presence of sulphonic and carboxylic groups enables the iron ions to be in the vicinity of the cellulose backbone chain. In this case, the radicals formed can easily attack the cellulose chain leading to the formation of a cellulose macroradical. Grafting of methyl methacrylate on tertiary aminized cotton using the bi-sulphite-hydrogen peroxide redox system was also investigated [58]. 

In the course of this study, the authors determined /Lvalues for dibenzyl, methyl phenyl, methyl p-nitrophenyl, di-p-tolyl, di-isopropyl and tetramethylene sulphoxides and for diethyl, dipropyl and dibutyl sulphites. The /Lscales are applied to the various reactions or the spectral measurements. The /Lscales have been divided into either family-dependent (FD) types, which means two or more compounds can share the same /Lscale, family-independent (FI) types. Consequently, a variety of /Lscales are now available for various families of the bases, including 29 aldehydes and ketones, 17 carboxylic amides and ureas, 14 carboxylic acids esters, 4 acyl halides, 5 nitriles, 10 ethers, 16 phosphine oxides, 12 sulphinyl compounds, 15 pyridines and pyrimidines, 16 sp3 hybridized amines and 10 alcohols. The enthalpies of formation of the hydrogen bond of 4-fluorophenol with both sulphoxides and phosphine oxides and related derivatives fit the empirical equation 18, where the standard deviation is y = 0.983. Several averaged scales are shown in Table 1588. 

By taking a sulphurous acid solution and titrating with sodium hydroxide and methyl orange until the sodium hydrogen sulphite is formed, then adding excess of mercuric chloride and completing the titration, sulphurous acid itself may be estimated. 

It is also possible with sulphurous acid solutions, using methyl orange as indicator, to titrate with a standard solution of an alkali to the halfway bisulphite stage.6 If necessary the alkali hydrogen sulphite may then be estimated by the addition of mercuric chloride and further titration with alkali, as already described. By this double titration method it is possible to estimate sulphurous aeid in the presence of other sulphur acids.7... 

The Sulphites.—Sulphurous acid gives rise to normal sulphites of the type M2S03 and acid salts of the type MHS03, where M represents a univalent metal atom. The normal salts are odourless and do not resemble the free acid or sulphur dioxide in their very harmful effect on living organisms. On the other hand, the acid sulphites readily yield sulphur dioxide they have an acid reaction towards phenolphthalein, but are neutral towards methyl orange. 

Trimethyl tellurium iodide, (CH3)3TeI,4 may be prepared by treating the dimethyl di-iodide with sodium sulphite and methyl iodide, or by reducing the di-iodide to dimethyl telluride and treating the latter with methyl iodide. The most recent method of preparation... 

The determination of aldehydes and ketones is of importance in the analysis of those essential oils characterised especially by aldehydic or ketoruc principles, e g.,the citral contained in lemon and lemongrass oils, citronellal in citronella Oil and some eucalyptus oils, benzaldehyde in bitter almond oil, salicylaldehyde in meadow-sweet oil, anisaldehyde in aniseed and fennel oils, cuminaldehyde m cumin oil, cinnamaldehyde in cinnamon oil, carvone in caraway oil, pulegone in pennyroyal oil and methyl nonyl ketone in rue oil The determination of the aldehydes and ketones presents, however, difficulties and the above methods are moderately exact in only a few cases, especially when the content of aldehydes or ketones is considerable The bisulphite method is applicable particularly to the determination of cinnamaldehyde and benzaldehyde in cinnamon oil and bitter almond oil, and, up to a certain pomt, to that of citral in lemongrass Oil. The sulphite method gives good results in the same cases and for the determination of carvone and pulegone... 

British Technical Records [6] mentioned another approach to the problem of utilization of sulphitation liquors. According to these data, attempts were made in Great Britain during World War I to make use of the reactivity of the sulpho group in the ortho or para position to the nitro ones. By acting with methylamine, N-methyl-dinitrotoluidine (I and II) was obtained, which, when further nitrated, yielded methyltetryl All the methods mentioned proved uneconomical. 

Isobutyraldehyde is another reagent that has been applied to condensation with amino acids [261 ]. The reaction of methyl ester hydrochlorides of amino acids with isobutyraldehyde and sodium hydrogen sulphite proceeds in a solution of sodium carbonate according to Scheme 5.23. The azomethines produced were chromatographed either as such or as N.-alkyl esters after reduction with zinc powder in methanolic hydrogen chloride. N-Isobutylidene methyl esters of most of amino acids, except His, Arg, Trp,... 

Schwicker claimed to have prepared distinct derivatives by the action of ethyl iodide, but a repetition of his work by Fraps1 led to negative results. Arbusoff2 investigated the interaction of methyl iodide and the double sulphites obtained by Schwicker s method, the sodium atom in each instance being replaced by a methyl-group, with formation of the same compound,... 

Potassium hyposulphite, K2S204.—The hyposulphite is obtained in the form of trihydrate by a method analogous to that employed for the sodium salt. A solution of potassium sulphite containing free sulphurous acid is treated with zinc-dust, and filtered after precipitation of the zinc by addition of slaked lime. On mixing the solution with alcohol, the trihydrate is deposited in very unstable yellow crystals. When boiled with acetone or methyl alcohol and dried in vacuum, they... 

CHLOROETHYL-P -(p-tert-BUTYLPHENOXY)-a -METHYLETHYL SULFITE P-CHLOROETHYL-P-(p-tert-BUTYLPHENOXY)-a-METHYLETHYL SULPHITE 2-CHLOROETHYL l-METHYL-2-(p-tert-BUTYL-PHENOXY)ETHYL SULPHITE 2-CHLOROETHYL SULFUROUS ACID-2-(4-(l,1-DIMETHYLETHYL-)PHENOXY)-l-METHYLETHYL ESTER 2-CHLORO-ETHYL SULPHITE of l-(p-tert-BUTYLPHENOXY)-2-PROPANOL COMPOUND 88R ENT 16,519 NIAGARAMITE ORTHO-MITE 88-R... 

CHLOROETHYL l-METHYL-2-(p-tert-BUTYLPHENOXY)ETHYL SULPHITE see SOP500 l-(2-CHLOROETHYL)-3-(4-METHYLCYCLOHEXYL)-l-NTTROSOUREA see CHD250... 

Eu(N03)3 has been shown to form essentially 1 1 adducts with L-azetidine-2-carboxylic acid (480) and Eu(fod)3 forms similar adducts with dialkylnitrosamines. (487) 1 1 Stoichiometry between Eu(fod)3 and various cyclic 6-membered sulphites has been assumed. (488) Both 1 1 and 1 2 adducts have been reported for Eu(fod)3 bound to cyclohexanones and cyclohexanols, (489) n-hexylamine, (490) hexamethylphosphoramide, (491,492) and methyl dimethylcarbamate. (493)... 

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