Butyric 3-mercapto

METHYLTHIO BUTYRATE METHYL 3-METHYLTHIO PROPIONATE 4-METHOXY- METHYL BUTANE-2-THI0L 8-MERCAPTO MENTHAN-3-0NE... 

CIC Ethyl butyrate contribute to the fruity, estery note linalool, alpha-terpineol, citronellol and damascenone support the floral, fruity ripe character and 1,8-cineol imparts the freshness. 4-methoxy-2-methyl-2-mercapto butane is responsible for typical catty sulphurous black currant note. Extracts of the black currant buds are more green, herbaceous but they also contain the sulphurous CIC. A similar note, 8-mercapto-p-menthan-3-one has been identified in buchu oil and is often used to imitate the catty black currant aspect. 

However, the addition occurs contrary to the Markovnikov rule under irradiation by ultraviolet light or in the presence of peroxides 1 for instance, allyl-amine hydrochloride or a derivative thereof in alcoholic solution is thiolated by an excess of hydrogen sulfide under UV-irradiation, exclusively (yields up to 57%), to give 3-aminoalkanethiols.2 Addition of hydrogen sulfide is of use in the laboratory only when the reaction can be carried out in the liquid phase and is then preferably effected under the influence of a basic catalyst Dahl-bom,3 for instance, obtained 3-mefcapto-butyric acid from crotonic acid hydrogen sulfide in the presence of diethylamine in a closed vessel at 70° and 4-mercapto-4-methyl-2-pentanone is obtained in 80% yield from mesityl oxide and hydrogen sulfide with triethylamine as catalyst.4... 

The carbojylation of unsaturated PHA has been performed through reactions that involved the conversion of the double bonds to thioethers via the free-radical addition of 11-mercaptoundecanoic acid or (R)-3-mercaptopropionic acid. Transesterification reactions of poly(3-hydro y butyrate) were carried out under reflux of 1,2-dichlorobenzene in the presence of 1,4-butane diol, poly(ethylene glycol) bis(2-aminopropyl ether) with molecular weights of 1000 and 2000, poly(ethylene glycol)methactylate or glycerol at 180 °C. Addition reactions of bromine and the -SH groups of 3-mercaptopropionic acid to the double bond of poly(3-hydro)y-10-undecenoate) were also carried out. The molecular weights of the modified polymers (despite the addition of mercapto acids to the double bonds) remained almost constant. " ... 

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