Hydrochloric Acid → Carvone, (-)-

Beteiligte Stoffe

Reaktionsschritte

Synthesis of the exemplary Formula VI terpene compound L-Carvone (2-cyclohexen-1-one, 2-methyl-5-(1-methylethenyl)-(R); Millenium Chemicals) from D-limonene is described in Ikan, Natural Products—A Laboratory Guide pp. 151-155 (Academic Press, 1969), incorporated herein by reference. Briefly, a solution of D-limonene in isopropanol is cooled to below 10° C. Solutions of HCl in isopropanol and concentrated aqueous sodium nitrite are added dropwise to the D-limonene solution to generate limonene nitrosochloride. The limonene nitrosochloride and dimethylformamide is refluxed with isopropanol. After cooling, crystallization is induced and the precipitate filtered and washed with water. The resulting L-carvoxime is refluxed with 0.5 M oxalic acid and the mixture is steam distilled. The distillate is extracted with ether, dried over anhydrous magnesium sulfate, and the excess ether evaporated to leave L-carvone.

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