Isobutyl disulfide

One patent describes a continuous process involving an aqueous alkah metal hydroxide, carbon disulfide, and an alcohol (82). The reported reaction time is 0.5—10 min before the mixture is fed to the dryer. The usual residence time is on the order of hours. A study ia the former USSR reported the use of the water—alcohol azeotrope for water removal from isobutyl or isoamyl alcohol and the appropriate alkah hydroxide to form the alkoxide prior to the addition of carbon disulfide (83). 

Dermal Effects. Skin irritation was noted in wildlife officers at the RMA after they handled sick or dead ducks without gloves (NIOSH 1981). Although the investigators concluded that diisopropyl methylphosphonate contributed to the local effects, a number of other compounds were present. Analysis of the pond water indicated the presence of a number of organic and inorganic contaminants, including diisopropyl methylphosphonate (11.3 ppm) aldrin (0.368 ppm) dieldrin (0.0744 ppm) dicyclo-pentadiene, bicycloheptadiene, diethyl benzene, dimethyl disulfide, methyl acetate, methyl isobutyl ketone, toluene, and sodium (49,500 ppm) chloride (52,000 ppm) arsenic (1,470 ppm) potassium (180 ppm) fluoride (63 ppm) copper (2.4 ppm) and chromium (0.27 ppm). Because of the presence of numerous compounds, it is unclear whether diisopropyl methylphosphonate was related to the irritation. 

Figure 1. Separation of selected solvents spiked into a synthetic sample at TLV levels (A) aqueous phase, (B) carbon disulfide phase 1, ethanol, 2, acetone, 3, carbon disulfide, 4, 2-propanol, 5, 1-propanol, 6, methyl ethyl ketone, 7, ethyl acetate, 8, 1-butanol, 9, isopropyl acetate, 10, n-hexane, 11, n-propyl acetate, 12, methyl isobutyl ketone, 13, toluene (19)...

Methyl-corypalline Methyl eugenol Methyl isobutyl ketone Methyl isocupressate Methyl-l-propenyl disulfide Methyl-laurate Methyl-n-amyl ketone Methyl n-nonyl ketone Methyl nigakinone Methyl palmitate Methyl-pelletierine Methyl salicylate Methyl-swertianin Methylacetic acid Methylanthranilate Methylchavicol Methylcytisine... 

Ethyl alcohol Ethyl phthalate Hydrogen bromide Hydrogen chloride Hydrogen disulfide Isoamyl alcohol Isobutyl alcohol Nitrobenzene (crit.temp., upper layer, 40) o-Nitrobromobenzene (m.p. 42)... 

Iron—manganese alloy, see Ferromanganese, 4383 f Iron pentacarbonyl, see Pentacarbonyliron, 1808a Iron pyrites, see Iron disulfide, 4395 Iron—silicon alloy, see Ferrosilicon, 4384 Iron—titanium alloy, see Ferrotitanium, 4385 t Isobutene, see 2-Methylpropene, 1577 t Isobutyl acetate, 2496... 

When (67) was treated with a wide variety of cycloaddition reagents under various conditions, it behaved as a diene or a dienophile but not as a 1,3-dipole. As a dienophile it reacted with 2,3-dimethyl-1,3-butadiene to give (70) and with cyclopentadiene to give an analogous product. As a diene it reacted with [2.2.1] bicycloheptene to give (72), presummably via (71), by loss of carbon monoxide and hydrogen. No products were isolated when (67) was treated with maleic anhydride, dimethyl acetylene-dicarboxylate, diphenylacetylene, dimethyl fumarate, carbon disulfide, isobutyl vinyl ether, cyclohexene, and cyclopentene. 

Potassium isobutyl-xanthogenate O-lsobutylthiocarbonic acid disulfide 363)... 

Dibenzyl Disulfide Solution Accurately weigh 0.75 g of dibenzyl disulfide, and place in a 250-mL volumetric flask. Dilute to volume with methyl isobutyl ketone, and mix. 

In this chapter, we presented the principal products of RVX hydrolysis with excess water in an acid medium. It has been shown that after the 3 months exposure, close to 1% of the initial amount of RVX in the solution could be detected. According to data on RVX hydrolysis with an equimolar amount of water, the autocatalytic hydrolysis of RVX was almost completed after 3 months, since the RVX content in the sample was no more than 0.01%. Moreover, the reaction mixture was much poorer than in the case of hydrolysis with excess water. Isobutyl MPA, which catalyzes RVX degradation, was detected as the major component of the reaction mixture. Yang et al (1996) found 2-(diethyl amino)ethanethiol as the second major component of the mixture, but in our experiment it was almost completely converted into bis[2-(diethylamino)ethyl]disulfide. 

C8H180 tert-butyl isobutyl ether 33021-02-2 439.93 38.143 2 15615 C8H18S2 di-tert-butyl disulfide 110-06-5 513.34 45.167 2... 

C6H140 ethyl isobutyl ether 627-02-1 164.11 8.961 2 9130 C6H14S2 dipropyl disulfide 629-19-6 187.68 13.810 1... 

FIG. 6—Standard chromatogram of 13 sulfur compounds in the range of 170-300 ppm sulfur. The column was an 18 m, 0.25 mm id, 0.25 micron PDMS, programmed at 30°C for 2 min to 200°C at 30 C /min lit rate 10 1, Helium carrier, 30 cm/sec [Peak identifications (1) Dimethyl Sulfide (2) Isopropyl mercaptan (3) Tert-butyl mercaptan (4) Propyl mercaptan (5) Sec-butyl mercaptan (6) Isobutyl mercaptan (7) Diethyl sulfide (8) Butyl mercaptan (9)Dimethyl disulfide (10) Dipropyl sulfide (11) Diethyl disulfide (12) Diisoprcpyl disulfide (13) Dipropyl disulfide]. 

Isobutyltrimethylethane. See Isooctane Isobutyl Tuads . See Tetraisobutylthiuram disulfide Isobutyl valerate CAS 10588-10-0... 

Hazardous Decomp. Prods. Carbon disulfide, carbonyl sulfide, potassium sulfide, isobutyl alcohol heated to decomp., emits toxic fumes of SOx and K2O... 

Barium petroleum sulfonate t-Butylaminoethyl methacrylate C6-10 alcohols C8-10 alcohols C16-20 alcohols Diethylaminoethyl acrylate Dimethylaminoethyl methacrylate Isobutyl methacrylate Jtaconic acid Nonylphenol Oleamine Stearyl methacrylate Tetramethylthiuram disulfide lube oil agent... 

Graphite Hexyl laurate Isobutyl tallowate Isotrldecyl stearate Methyl hydroxystearate Molybdenum disulfide Pentaerythrityl stearate Phenyl dimethicone Phenylmethyl/dimethylsiloxane copolymer Polydimethylsiloxane, trimethylsiloxy-terminated PPG-2-buteth-3 PPG-3-buteth-5 PPG-7-buteth-10... 

Tables 14.25.1 and 14.25.2 provide data on the reported releases and transfers of solvents by the US rubber and plastics industry. These industries contribute small amounts of VOC which are in the range of0.00001-0.00005 kg VOC/kg of processed rubber. It was the ninth largest contributor to releases and transfers of all US industries. Dichloromethane, toluene, carbon disulfide, methyl ethyl ketone, methanol, 1,1,1-trichloroethane, hexane, methyl isobutyl ketone, and xylene are emitted in very large quantities.

Methanol, ethylene glycol, toluene, xylene, and carbon disulfide occupy the highest places in Tables 14.32.1-14.32.3, followed by mefliyl ethyl ketone, dichloromethane, 1,1,1-trichloroethane, tert-butyl alcohol, hexane, and methyl isobutyl ketone. These eleven solvents constitute 86% of all 550,738 tons of solvents released and transferred per year. Methanol alone constitutes over a quarter (27.1%) of the released and transferred solvents. 

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