Ethyl acetate mercaptan

Rankine (6, 38) believes that the differences in the secondary products formed in wines during fermentation by various yeasts are quantitative rather than qualitative, and careful selection of pure yeast strains can eliminate wine disorders caused by large amounts of undesirable by-products such as hydrogen sulfide, mercaptans, acetaldehyde, acetic acid, ethyl acetate, higher alcohols, etc. 

Properties Light-cream-colored to light-tan, crystalline powder mild mercaptan-like odor. Mp 198-207C (decomposes). Stable in air. Practically insoluble in water soluble in ethyl acetate and ethanol slightly soluble in methanol. 

To a cold 0°C solution of 7V-Fmoc- or Boc-protected a-amino acid (10 mmol) and benzyl mercaptan (20 mmol, 2.48 g) in dichloromethane (30 mL) are successively added 4-(dimethylamino)pyridine (DMAP) (1 mmol, 122 mg) and 1,3-dicyclohexylcarbodiimide (DCC) (10.5 mmol, 2.17 g). After the reaction mixture is stirred overnight and the solvent removed in vacuo, ethyl acetate (100 mL) and a 1 N potassium hydrogen sulfate solution are added. The organic layer is washed with 1 N potassium hydrogen sulfate (2 X 60 mL) and saturated NaCl solution (60 mL), dried over magnesium sulfate, and filtered. The solvent is removed in vacuo and the 5-benzyl thioester is recovered as a white solid after precipitation with ether-hexane (1 1, v/v). 

For example, the ethyl acetate anion 2, generated in situ by thermal decarboxylation of the K-salt of monoethyl malonate, cleaves the isothiazolium ion 1 by S-attack and formation of the ring-open iminothiolate 3, which cydizes to the 3-aminothiophene-2-carboxylate 5 by intramolecular aza-analogous aldol addition ( 4) and elimination of methyl mercaptan. 

Ctolonaldehyde Cumene Cyctoheiane Oracelone Dibutyl Phosphite Oibutyl Phthalate Dichloroethane Dichloropentane Diesel Oil Diethylbenrene Oiethyleneglycol Diethyl Sullate Dimethyl Phthalate Dioiane Dipentene Diphenyl Dowtherms EtherDielhyl Ether Petroleum Ethyl Acetate Ethyl Alcohol Ethyl Benrene Ethyl Chloride Ethyl Mercaptan Ethyl Sullate Ethylene... 

Mercaptals, CH2CH(SR)2, are formed in a like manner by the addition of mercaptans. The formation of acetals by noncatalytic vapor-phase reactions of acetaldehyde and various alcohols at 35°C has been reported (67). Butadiene [106-99-0] can be made by the reaction of acetaldehyde and ethyl alcohol at temperatures above 300°C over a tantala—siUca catalyst (68). Aldol and crotonaldehyde are beheved to be intermediates. Butyl acetate [123-86-4] has been prepared by the catalytic reaction of acetaldehyde with 1-butanol [71-36-3] at 300°C (69). 

The lead acetate removes any unreacted m ethyl mercaptan by precipitating it as the lead salt. 

Further evidence for a pseudooxazolone intermediate is the fragmentation of 72 by ethyl mercaptan in hydrobromic acid-acetic acid [Eq. (33)]. The mercaptal 74 hydrolyzes readily in acetic acid to give the 2-0X0 acid. 

ETHYLENE GLYCOL ETHYL MERCAPTAN DIMETHYL SULPHIDE ETHYL AMINE DIMETHYL AMIDE MONOETHANOLAMINE ETHYLENEDIAMINE ACRYLONITRILE PROPADIENE METHYL ACETYLENE ACROLEIN ACRYLIC ACID VINYL FORMATE ALLYL CHLORIDE 1 2 3-TRICHLOROPROPANE PROPIONITRILE CYCLOPROPANE PROPYLENE 1 2-DICHLOROPROPANE ACETONE ALLYL ALCOHOL PROPIONALDEHYDE PROPYLENE OXIDE VINYL METHYL ETHER PROPIONIC ACID ETHYL FORMATE METHYL ACETATE PROPYL CHLORIDE ISOPROPYL CHLORIDE PROPANE... 

Propionic Acid Glyoxal, 40% Solution Ethylenediamine Cyanogen Oxalic Acid Sodium Oxalate Ethylene Glycol Acetonitrile Ethyl Mercaptan Acetic Acid... 

Glutaraldehyde Solution Acetylacetone N-Amyl Mercaptan N-Amyl Alcohol Pentaerythritol 1-Pentene Amyl Acetate N-Amyl Alcohol Ethyl Butanol N-Amyl Chloride N-Amyl Methyl Ketone N - Amyltrochlorosilane Peracetic Acid Urea Peroxide Perchloric Acid Perchloric Acid... 

Uses of the Sulphides of Phosphorus.—The pentasulphide of phosphorus is used to replace the oxygen of organic compounds by sulphur thus ethyl alcohol gives ethyl mercaptan, and acetic acid thioacetic acid.4 The reactions, however, are somewhat complex thus with ethyl alcohol the first product has been shown to be diethyl-dithiophosphate, SP(SH)(OEt)s, the mercaptan being produced by a secondary reaction.5 Phosphorus pentasulphide, boiling under atmospheric or other definite pressure, has been recommended for use in constant temperature baths in place of sulphur. The compound P4S3, which is one of the most stable sulphides in diy air, but resembles phosphorus in some respects, is used as a substitute for this element in the manufacture of matches.6... 

Empyreumatic odors, evocative of smoke, burnt wood, and cooked meat, are common descriptors used by wine tasters. Until now, a few sulfur compounds with these odors had been identified and assayed in wine at concentrations above their perception thresholds methylthiopropionic acid (Schreier and Drawer 1974), 2-sulfanylethyl acetate (V), and 3-sulfanylptopropyl acetate (X) (Lavigne et al. 1998). Two mercaptans, ethyl 3-sulfanylpropionate (VII) and ethyl 2-sulfanylpropionate (I), have been identified as constituents in the aroma of Vilis labrusca, Concord grapes (Kolor 1983) and both have also been found in Vitis vinifera wine (Tominaga et al. 2003a Blanchard 2000). 

ALKYLATION Benzyltiiethylammonium chloride. n-Butyl mercaptan. Dialkylcar-bonium fluoroborates. Diethoxycarboni-um fluoroborate. Dimethylcopperlithium. Ethyl vinyl ether. Dimethylformamidc dimethyl acetal. Dimethyl sulflde. Dimeth-ylsulfonium methylide. Ethyl chlorofor-mate. Hexamethylphosphoric tiiamide. Lithium diisopropylamide. Lithium N-iso-propylcyclohexylamide. O-Methyldiben-zofuranium fluoroborate. Methyl fluoro-sulfonatc. Naththalene-Sodium. Palladi-um(II) chloride. 1,2,2,6,6-PentamelhyI-pipetidine. Potassium hydroxide. Silver oxide. Sodium bis-2-mcthoxyethoxyaIu-minum hydride. Sodium hydride. Thai-lous ethoxide. 

Cleavage of streptomycin with ethyl mercaptan and hydrogen chloride yielded streptidine and a new derivative of streptobiosamine, ethyl thio-streptobiosaminide hydrochloride diethyl mercaptal. Treatment of methyl streptobiosaminide hydrochloride dimethyl acetal with ethyl mercaptan and hydrogen chloride readily yielded the same mercaptal hydrochloride. It thus was apparent that the relationship between these two compounds resided simply in the replacement of methoxy by thio-ethoxy groups on the same carbon skeleton. Acetylation of the mercaptal yielded two anomeric forms of ethyl tetraacetylthiostreptobiosaminide diethyl mercaptal. ... 

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