Mercaptanes tertiary butyl

Natural gas has no distinctive odour (except for very sour gases), and for safety reasons, pipeline companies and utilities commonly odorise the gas either as the gas enters the transmission system, or within local distribution zones. Various odorants may be used, the most common being mixtures of thiophenes and mercaptans. Tefiahydrothiophene (THT) is widely used throughout Europe and in the US (as Pennwall s odorant), whereas in the UK a cocktail of compounds is used comprising ethyl mercaptan, tertiary butyl mercaptan, and diethyl sulphide. 

Odor is a sensation associated with smell, which can be hard to quantify. The same quantities of different materials cause different odor intensities. The unit of odor intensity (W) is based on the odor of tertiary butyl mercaptan or TBM (W = 1.0). Using that reference, H2S, for example, has an odor intensity of W = 0.08, or 8% of TBM. Most odorant substances contain sulfur. Table 3.31 lists a number of odorant substances and their relative odor intensities (W). 

TBM Tertiary butyl mercaptan 2-methyl 2-propanethiol (CH3)3CSH 1.00 (ref)... 

Beilstein Handbook Reference) BRN 0505947 EINECS 200-890-2 HSDB 1611 t-Butyl mercaptan tert-Butanethiol tert-Butyl mercaptan tert-Butylthiol tertiary-Butyl mercaptan. Has skunk-like odor. Used as additive to natural gas for leak detection. Liquid mp = -0.5° bp = 64.3° d = 0.7943 soluble in organic solvents, insoluble in H2O. Lancaster Synthesis Co. Mallinckrodt Inc. Sigma-Aldrich Fine Chem. 

The final unequivocal experimental proof that the observed effects were indeed peripheral ones was obtained in psychophysical experiments. Tertiary butyl mercaptan was used as the target in a monorhinal presentation. Its perceived odor intensity remained unchanged when in a dichorhinal experiment the contralateral na-ris was exposed to a very low Intensity of l -cyclohexyl-l -methyl-2-pentanone (CMP, 13). However, in agreement with established crossover additivity, the total perceived overall odor intensity showed a small, but statistically significant increase. Then the two separate odorant streams of the dichorhinal experiment were combined and the mixture of malodor (t.-butyl mercaptan) and AMAL (CMP) presented to the subjects again. Perceived overall intensity was reduced by and perceived malodor intensity by 85 at a significance level of 5%. 

Phillips Petroleum Company (1990) Toxicity study summary of tertiary butyl mercaptan (T0X1-6). Unpublished report to the Environmental Protection Agency, Washington, DC, USA. Submitted to WHO by the International Organization of the Flavor Industry, Bmssels, Belgium. 

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-... 

Tertiary-butyl mercaptan is added in trace amounts as an odorant. This grade of gas has a sulfur content of 0.002 grains/100 ft (0.0457 mg/m ) and a typical gross heating value of 1044 Btu/ft (38 898 kJ/m ). 

Tertiary Butyl Catechol Tertiary But Mercaptan Tetrabromoethane Tetrabromomethane Tetrabutyl Titanate ... 

Tertiary butyl alcohol (see Butyl alcohol, tert) Tertiary butylcatechol (see Butylcatechol, tert) Tertiary butylmercaptan (see Butyl mercaptan, tert)... 

Similar products are obtained from the photosensitized decomposition of the tertiary azides, suggesting that decomposition may result from the triplet azides under both direct and sensitized photolysis/461 Additional evidence for a discrete nitrene intermediate comes from the observation that this intermediate can be trapped by decomposition of the azides in the presence of good hydrogen donors such as tri- -butyItin hydride and jec-butyl mercaptan. Triarylamines result ... 

We must also consider the relative reactivities of the bonds. In the absence of direct data, we can compare bond dissociation energies as a measure of relative reactivity. Table 11-3 shows some pertinent data collected from various sources [18, 19, 20, 21]. The carbon-sulfur dissociation energies for n-alkyl monosulfides and n-alkyl mercaptans lie within a narrow range. Whether the other sulfur linkage is to carbon, as in n-alkyl monosulfides, or to the hydrogen of a mercaptan has no major influence. There is a small but perceptible trend toward weaker bonding with secondary carbon (isopropyl) and with tertiary carbon (t-butyl) in the unsymmetrical methyl aryl monosulfides, a trend that is not firmly evident in the in the corresponding alkyl mercaptans. The vinyl-sulfur... 

In this example butyl glycol is mixed with butanol. Depending upon the ratios, the reflux temperature will be mo fied. Chain transfer agent tertiary dodecyl mercaptan is present to control molecular weight. The initiator is added separately being slurried with solvent. 

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