Ethanethiol 1,1-dimethyl

HN-2) 2-(Diisopropylamino)ethanethiol Dimethyl isopropylphosphonate Cyclopentyl methylphosphonofluoridate Isopropyl trimethylsilyl 5842-07-9 7284-82-4 1115.8 1244.6... 

In a third experiment, we used permeation tubes (HRT type, Kin-tek, Laurel, TX) to slowly release the sulfur compounds ethanethiol, dimethyl disulfide, and dimethyl sulfide from within traps. We placed permeation tubes (one tube of each chemical) within black-felt covered lure holders within each brown tree snake trap. We set a series of trap-lines adjacent to Scout Beach during August 1997 to examine the attractiveness of these chemicals. We set three chemical lure traps, three live mouse lure traps, and three empty control traps in four trap-lines. Trap-lines were moved daily for four nights to produce 12 trap-nights per treatment. 

For our fourth experiment, we used singly presented sulfur compounds as lures. Trap-lines were run adjacent to Scout Beach Guam during August of 1997. We set three traps of each treatment type. The treatments were ethanethiol, dimethyl disulfide, dimethyl sulfide (in permetation tubes), live mice, and empty control traps. Trap-lines were moved daily for five nights to produce 15 trapnights per treatment. 

Figure 2. Capture rate by lure provided for brown tree snakes on Guam based on 12 trap-nights per treatment. M = live mouse, Combined = ethanethiol, dimethyl disulfide, and dimethyl sulfide presented simultaneously, C = empty, clean trap control. Bars represent one standard error.

In the third experiment, using ethanethiol, dimethyl disulfide, and dimethyl sulfide compounds simultaneously was not as effective as live mice in luring brown tree snakes into traps (F2 33 = 0.015 Figure 2). We captured one snake in 12 trapnights. This capture rate was 16% as effective as live mice, with which we captured six snakes (50% capture rate Tukey test, P = 0.055). 

In the fourth experiment, when the compounds were presented individually, differences were more striking = 12.923 P < 0.001). Twelve snakes were captured with mice (80% capture rate), but none were captured with ethanethiol, dimethyl disulfide, dimethyl sulfide or in the control traps. 

Ha-Dimethyl sulfide was used to quantify methanethiol, ethanethiol, dimethyl sulfide, diethyl sulfide, methyl thioacetate, S-ethyl thioacetate. Isopropyl disulfide was used for dimethyl disulfide, diethyldisulfide, carbon disulfide, dimethyl trisulfide. Other compoxmds including 2-mercaptoethanol, 2-(methylthio)-l-ethanol, 3-(methythio)-l-prop)anol and 4 (methylthio)-l-butanol were quantified using 3-(methylthio)-l-hexanol as the internal standard. 

Simple thiols and organic sulfides, such as methylthiol, ethanethiol, dimethyl sulfide and dimethyl disulfide, give 100% production of the protonated parent [41,42], with the reactions taking place at the collisional rate limit. 

Organic acids, including carbon dioxide, lower the wort pH during fermentation. The principal acids formed are lactic, pymvic citric, malic, and acetic acids, at concentrations ranging from 100—200 ppm. The main sulfur compounds formed during fermentation and thek perception thresholds are as follows H2S (5—10 ppb) ethanethiol (5—10 ppb) dimethyl sulfoxide (35—60 ppb) and diethyl sulfide (3—30 ppb). At low levels, these may have a deskable flavor effect at higher levels they are extremely undeskable. Sulfur dioxide also forms during fermentation, at concentrations of 5—50 ppm its presence can be tasted at levels above 50 ppm. 

Isobutyl methylphosphonic acid, 2-(Diethylamino) ethanethiol, and P,P-diisobutyl dimethyl diphosphonate. 

Mercaptomethylpyridine forms a zinc complex of the form ZnL2, and the zinc has a tetrahedral N2S2 geometry.125 Similarly, the monomeric tetrahedral zinc complex of 2-(dimethyl-amino)ethanethiolate, ZnL2, was structurally characterized.856... 

Fluorine bonded to higher condensed ring systems can also be replaced. Thus, 5-fluoro-3-mcth-oxy-7,12-dimethylbenz[ ]anthracene reacts with the sodium salt of ethanethiol in dimethyl-formamidc (155°C, 3 h) to yield 5-(eLhylsull anyl)-3-hydroxy-7,12-dimethylbcnz[ ]anthraccnc (58% mp 118-121 °C).y... 

B. Orcinol Monomethyl Ether. In a 1-1. three-necked flask equipped with a magnetic stirrer, a condenser, a dropping funnel, and a nitrogen inlet are placed 250 ml. of dry dimethyl-formamide (Note 6) and 22 g. (0.55 mole) of sodium hydride (60% oil dispersion). The suspension is stirred under an atmosphere of dry nitrogen and cooled with an ice bath while a solution of 31 g. (37 ml., 0.50 mole) of ethanethiol (Note 7) in 150 ml. of dry dimethylformamide (Note 6) is added slowly from the dropping funnel over a period of 20 minutes. The ice bath is removed and stirring is continued for an additional 10 minutes. A solution of 38.0 g. (36.5 ml., 0.25 mole) of orcinol dimethyl ether in 100 ml. of dry dimethylformamide (Note 6) is added in one lot, and the mixture is refluxed under an atmosphere of dry nitrogen for 3 hours (Notes 8 and 9), The mixture... 

See Xenon difluoride Dimethyl sulfide f0929. Ethanethiol... 

A solution of ethanethiol in dimethylformamide (DMF) are added dropwise to a suspension of sodium hydride (55% suspension in oil) in dry DMF. The obtained suspension is stirred for a further 45 min and a solution of 2, 5-dimethoxy-9,9-dimethyl-6,7-benzomorphan in 190 ml of dry DMF are added dropwise over 20 min. The initially formed volatile components are distilled off and the reaction mixture heated until the DMF boils. After boiling for 6 h under reflux the reaction mixture is concentrated under reduced pressure and the residue taken up in toluene and 2 N hydrochloric acid. The acid aqueous phase is made alkaline with 25% ammonia and extracted 3 times with chloroform/butanol (8 2). After evaporation of the organic phase, the residue is converted into the 9,9-dimethyl-2, 5-dihydroxy-6,7-benzomorphan hydrochloride, (crystallized from isopropanol). 

During a synthesis of quinone imine precursors to the Dynemicins, Myers and co-workers100 encountered problems with the lability of the dimethyl acetal function in 56,1 [Scheme 1.56] whilst removing the robust phenolic methyl group using sodium ethanethiolate in hot DMF, However prior conversion of the free hydroxy function in the substrate to the magnesium salt 56.2 by reaction with ethylmagnesium bromide afforded protection for the dimethylacetal under the strenuous conditions of nucleophilic demethylation. 

Selective demethylotion. Alkyl methyl phosphates undergo demethylation when treated with dimethyl sulfide or ethanethiol and methanesulfonic acid (equation I). The products are isolated as the aniline salts. 

These compounds, produced in the reaction of H2S and ethanal, have been detected in a synthetic solution and in a white wine by Rauhut and Dittrich (1993). These authors made H2S at concentrations from 1 to 5 mg/L react with ethanal at variables concentrations from 100 to 500 mg/L. This reaction produces cis-ltrans-3,6-dimethyl-1,2,4,5-tetrathiane, the cw-/fran -4,7-dimethyl-l,2,3,5,6-pentathiepane and the c -/fran -3,5-dimethyl-l,2,4-trithiolane and the precursor of these compounds, 1,1-ethanedithiol. However, the same reaction with copper does not prevent formation of these compounds. In contrast, the reaction reported by some authors between H2S and ethanal to form ethanethiol, does not take place. 

SYNS CEBETOX CYMETOX DEMEPHION ISONITOX 2-(METHYLTHI0)-ETHANETHI0L-0,0-DIMETHYL PHOSPHOROTHIOATE 2-(METHYL-THIO).ETHANETHIOL-S-ESTER with 0,0-DIMETHYI. PHOSPHOROTHIOATE TINOX... 

METHYLTHIO)-ETHANETHIOL-S-ESTERwith 0,0-DIMETHYL PHOSPHOROTHIOATE see MIW250 METHYLTHIOINOSINE see MPUOOO 6-xMETHYLTHIOINOSINE see MPUOOO METHYLTHIOKYANAT see MPTOOO METHYLTHIOMETHANE see TFPOOO... 

The benzyloxycarbonyl (Cbz) group can be removed from nitrogen by BF3 Et20 in the presence of either a thiol or dimethyl sulfide. The carbamates derived from secondary amines are cleaved more rapidly than those from primary amines by use of the ethanethiol method, even when using BF3 Et20 as solvent. This procedure is reasonably selective, as shown in Eq. (25) [46]. 

Carbamoylpyrazine was methylated to 3-carbamoyl-l -methylpyrazinium iodide by methyl iodide in methanol at reflux (138) and by methyl iodide in dimethyl sulfoxide at room temperature (666) under the latter conditions the rate of methylation relative to pyrazine was 0.53 (666). 3-Carbamoyl-l-methylpyrazinium iodide reacted with liquid ammonia at — 40° to give 2-amino-5-carbamoyl-l-methyl-1,2-dihydropyrazine (46) (609). With nitromethide ions in liquid ammonia, none of the carbon addition reaction was found (721), but with ethanethiolate ion in liquid ammonia it gave 5-carbamoyl-2-ethylthio-l-methyl-1,2-dihydropyrazine (721). 2-(4 -Morpholino)carbonylpyrazine with methyl iodide gave 3-(4 -morpholino)-carbonyl-1-methylpyrazinium iodide (870). 

For obvious reasons, inhibitors of cholesterol biosynthesis have aroused intense interest. Studies on a variety of species (mostly rats) have been made using 1-alkylimidazoles," colchicine," and chenodeoxycholic acid, the last work being particularly interesting as the metabolite affected HMG-CoA reductase but not cholesterol 7a-hydroxylase, the steps believed to be rate-limiting for the biosynthesis of sterols and of bile acids respectively. Arsenite, /8-mercaptoethanol, dithiothreitol, and ethanethiol all inhibited the biosynthesis of cholesterol from MVA in rat liver homogenates. The accumulation of 4,4-dimethyl-5a-cholest-8-en-3/3-ol together with the corresponding A -diene supported the view that... 

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