United States Patent Office
- 2,837,570 United States Patent Office Patented June 3, 1958 2 thesis of l-carvone from d-limonene glycol are repre sented as follows, along with the structural formulae of 2,837,570 l-carvone, d-limonene and d-limonene monoxide. For purposes of illustration, the intermediate substitution METHOD OF PREPARNG CARVONE 5 product formed in the dehydration and hydrolysis of the Seymour M. Linder, Eggertsville, and Frank P. Green 1-hydroxyhydrocarvone is represented as the semicar span, Buffalo, N.Y., assignors to Food Machinery and . bazone derivative of that compound. Chemical Corporation, San Jose, Calif. (His GH, CE No Drawing. Application March 21, 1956 -o COH Serial No. 572,789 10 6 Claims. (C. 260-587) Hic bH, C bH, NHMC NH/ 5 This invention relates to a method for preparing 1-car S n vone, and particularly to a method for preparing 1-car C /'sCH HC /o CH vone from d-limonene and certain d-limonene deriva : - d-limonene monoxide d-limonene glycol - tives. (H, CH 1-Carvone, the levoratory form of carvone, by reason COE O of its minty odor and flavor has found wide acceptance 20 / in the prepartion of cosmetics and comestibles. Typi HaC Yo-NNENH cally, it is used as a flavoring and perfuming ingredient for toothpaste, mouth wash, chewing gum and mint can dies. 1-Carvone is expensive, presently being obtained 25 from principally from spearmint oil in which it occurs / Sn naturally. HC CH The high cost combined with the usefulness of 1-car -carvone vone offers a strong incentive to chemists to devise syn thetic methods for preparing the material.
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