Methanethiol → 5-Methyl-2-(1-methyl-1-(methylthio)ethyl)cyclohexan-1-one
Reaktionsgleichung
[CH3:1][C@H:2]1[CH2:11][C:9](=[O:10])[C:5](=[C:6]([CH3:8])[CH3:7])[CH2:4][CH2:3]1.[CH3:12][SH:13]>C(N(CC)CC)C>[CH3:12][S:13][C:6]([CH3:7])([CH3:8])[CH:5]1[CH2:4][CH2:3][CH:2]([CH3:1])[CH2:11][C:9]1=[O:10]Komponenten
4
Edukt 2
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 1
Versuchsvorschrift
15.2 g of pulegone are treated with 0.5 ml of triethylamine and cooled to ca 0° by means of an ice-common salt mixture. With stirring, methyl mercaptan in excess is condensed into the mixture and, after condensation of 200% of the calculated amount, the mixture is transferred into an autoclave. After standing overnight at room temperature, the reaction mixture is heated to 50° and, after cooling of the autoclave, the reaction product immediately distilled in vacuum. 9.8 g of 8-methylthio-p-menthan-3-one are obtained as a clear liquid with pleasant odour reminiscent of peppermint, geranium and caraway, boiling point 72°-73°/0.15 mm Hg, nD20 1.4982. The yield amounts to 73% of the theory based on reacted pulegone. The two stereoisomeric compounds 8-methylthio-cis-p-menthan-3-one and 8-methylthio-trans-p-menthan-3-one obtained can be separated gas-chromatographically.