Carvacrol → Carvone, (-)-

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A mixture of 100 parts of R-(+)-1,2-limonene oxide, 75 parts of dihydrocarvone, 3 parts of carvacrol and 1 part magnesium hydroxide was refluxed at 212-220° C. for 10 hours in a three-necked flask equipped with agitator, temperature probe, and Dean-Stark trap (about 1 part water was removed). The reaction mixture was cooled down to 40° C., the catalyst was flittered out and the filtrate distilled under vacuum using Vigreux column. Distillate (160 parts) contains 28% unreacted 1,2-limonene oxide and 31% R-(−)-carvone. The yield of R-(−)-carvone is 49.6 parts or 68.8% on reacted 1,2-limonene oxide. This mixture was further purified using conventional separation techniques to obtain flavor grade R-(−)-carvone.

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