Online Encyclopedia


Online Encyclopedia
Originally appearing in Volume V26, Page 651 of the 1911 Encyclopedia Britannica.
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HYDROCARBONS, CtoH18, OF THE TERPENE SERIES Menthene, C,H,(CH3) (C3Hr)', is methyl-i-isopropyl-4-cyclohexene-3. It is obtained by the action of anhydrous zinc chloride or copper sulphate on menthol (J. W. Brfihl, Ber., 1892,• 25, Q. 142), by boiling menthyl chloride with aniline (G. Wagner, Ber., 1894, 27, p. 1636), by heating menthyl chloride with potassium phenolate (L. Masson, Ber., 1896, 29, p. 1843), and by the dry distillation of the methyl ester of menthyl xanthate (L. Tschugaeff, Ber., 1899, 32, p. 3333). It is a colourless liquid which boils at 167-168° C. When strongly heated with copper sulphate it yields cymene. According to Tschugaeff, the xanthate method alone gives a pure menthene of the above constitution, the menthene obtained from the dehydration of menthol being a cyclohexene-4; and the one obtained by 0. Wallach (Ann., 1898, 300, p. 278) from 1-menthylamine being a cyclohexene-2. Carvomenthene, C6H3(CH3)(C3H7), is probably methyl- l-isopropyl-4-cyclohexene-I. It is prepared by heating carvomenthyl bromide with quinoline, or by heating carvomenthol with potassium bisulphate to 200° C. It is a liquid which boils at 175-176° C. Cam phone, C;H9(CH3)2 is 1.7.7-trimethyl-bicyclo-(r•2. )-heptane. It is prepared by the action of sodium and alcohol on pinene hydriodide, or by reducing the hydriodide with zinc in acetic acid solution. It is a crystalline solid which melts at 153° C. and boils at 160° C.
End of Article: HYDROCARBONS

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