I-Butyl mercaptan

Butyl ether Butyl carbitol /i-Butyl glycidyl ether Butyl mercaptan p-tert-Butyltoluene Carbon disulphide Carbon dioxide Carbon monoxide Carbon tetrachloride Carbonyl sulphide Carbary ... 

AIBN = 2,2 -Azoisobutyronitrile, BMA = butyl methacrylate, CMA = cetyl methacrylate, LMA = lauryl methacrylate, LSI I = lauryl mercaptan, and MA = maleic anhydride. 

Gtmnal alkylation af ketones. Coates and Sowerby have reported a new method for site-selective geminal alkylation of ketones which involves reduction of the n-butylthiomethylene derivative of the ketone by lithium-ammonia to give a methyl-substituted cnolatc anion which can be alkylated in situ. The ketone, for example cyclohexanone (I), is condensed with ethyl formate and then transformed into the n-butylthiomethylene derivative (2) by reaction with n-butyl mercaptan (2, 53-54). This is then reduced with excess lithium in liquid ammonia at -33° with 2 eq. of a proton donor (water is usually used to avoid ovcralkylation). The lithium cnolate is then... 

Three isomers of butyl mercaptan (BYOO-til mer-KAP-tan) exist. Isomers are two or more forms of a chemical compound with the same molecular formula, but different structural formulas and different chemical and physical properties. The names and synonyms of the isomers are n-butyl mercaptan, known as l-hutanethiol, i-mercapto-butane, or n-butyl thioalcohol -butyl mercaptan, called 2-butanethiol or i-methyl-i-propanethiol and ferf-butyl mercaptan, also known as 2-methyl-2-propanethiol. The isomers have slightly different expanded chemical formulas n-butyl mercaptan, CH3CH2CH2CH2SH -butyl mercaptan, CH3CH2CH(SH)CH3 and ferf-butyl mercaptan, CH3C(CH3)(SH)CH3. The isomers have vastly differing melting points n-butyl mercaptan, —115.67 (—i76.2i°F) -butyl mercaptan,... 

Methyl-2-propanethiol 2-Propanethiol (i r -Butyl mercaptan) (Isopropyl mercaptan)... 

M. Calvin Actually, simple mercaptans with iodine give a quantitative stoichiometry to make 2 RSH -H Is — RSSR 4- 2H+ -F 2 I. Now, if this R group is of a certain special type you can actually get the sulfenic iodide but in order to get that one has to have a very special kind of mercaptan. One can get it with tertiary butyl mercaptan, but not with simple mercaptans, such as cysteine or gluta-... 

Fig. 2. Hammett equation plot of relative k. values vs.

Mercaptans are oxidised to disulphides by peroxodisulphate. Eager and Winkler studied the kinetics of the oxidations of n-butyl, n-octyl, and n-dodecyl mercaptans in acetic acid/water solvent (80 ml acid-I-20 ml water) and found first-order kinetics with respect to peroxodisulphate. The first-order rate coefficient increases with increase of mercaptan concentration, and reaches a limit at about 5 x 10 Af mercaptan. A decrease in the first-order rate coefficient with increase of the initial peroxodisulphate concentration was observed and attributed to a salt effect. Eager and Winkler suggested a mechanism involving sulphate radical ions. Levitt proposed a mechanism involving sulphur te-troxide, but there is no evidence for its formation in peroxodisulphate oxidations. 

The polybutadiene used was Intene from I. S. Rubber [77] = 2.1 dl/g in cyclohexane at 30°C. Vinyl chloride and styrene monomers from Montedison were 99.99 and 99.5% pure respectively. Azobis(isobutyronitrile) (AIBN) from Fluka was 99% pure. Di-te/t-butyl peroxide was 95% pure. Tert-butyl peracetate was used at a 50% dilution with dimethyl phthalate. The n-butyl ester of 3,3- (di-te/t-butylperoxy)valerianic acid was 85% pure. Terf-dodecyl mercaptan, a commercial product of the Societe Nationale des Petroles d Aquitaine, was used as a modifier. The solvents used were commercial products purified by fractionation. 

I. An emulsion consisting of 2,000 parts of water, 10 parts of an alkyl (C12 to C14) sulfonate, 960 parts of butyl acrylate, 40 parts of acrylic acid, 2.5 parts of 1.4 butanediol diacrylate, 1 part of potassium persulfate and 2.5 parts of dodecyl mercaptan is polymerized under nitrogen for 5 hrs at 60° to 65°C. (/iT-value according to Fikentscher in benzene about 50.)... 

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