Menth

Rectified oils have been redistilled to improve a particular property or characteristic, such as flavor or aroma. Eor example, natural oil of peppermint is frequently rectified to remove dimethyl sulfide, which has a powerful and objectionable cooked vegetable note deleterious to the use of the oil in cmme de menthe Hqueurs. Distillation is also used to remove psoralens, which are harmful photosensitizing agents present in natural bergamot oil. Color may be removed, eg, from cassia oil, by vacuum steam distillation. A desirable component, such as 1,8-cineole (eucalyptol) 85% in eucalyptus oil, may be... 

Of all these, probably P-phenethyl alcohol (2) comes closest to the odor of fresh rose petals however, mixing all these components does not reproduce the total fine character of the natural oil. It has been determined that a number of trace constituents representing less than 1% of the volatiles are critical to the development of the complete rose fragrance (10). These include cis- and trans-i.ose oxide (1), nerol oxide (12), rose furan (13), /)i7n7-menth-l-en-9-al (14), P-ionone (15), P-damascone (16), and P-damascenone (3). 

Start out simply, with a standard martini glass and lots of ice. A superb chill accelerates the mint and refines the brandy. And don t worry about that bottle of white creme de menth taking up space at your bar. 

Combine the brandy or vodka with creme de menthe in a chilled glass and stir. Garnish with mint candy. 

P-Pine Limon Menth Puleg Carvo Thym Carva... 

P-Kne = P-Knene Limon = limonene Menth = menthone Puleg = pulegone Carvo = carvone Thym = thymol Carva = carvacrol. 

Since the chemical addition of HCN always results in mixtures of cis/trans-isomers, the stereoselective HNL-catalyzed addition is of great advantage in the synthesis of natural products. The syntheses of the natural monoterpenes cis-p-menth-8-ene-l,7-diol and cA-/ -menthane-l,7,8-triol are interesting examples for the application of this methodology (Scheme 9). ... 

Scheme 9 Stereoselective synthesis of cw-p-menthane-l,7,8-triol (A) and cA-p-menth-8-ene-l,7-diol (B).

Heating of carvone in water at 210 °C for 10 min afforded 8-hydroxy-p-menth-6-en-2-one, the equilibrium position favoring the starting material by a factor of 4 1. The hydroxymenthenone, although in equilibrium with the starting material, also underwent elimination of water and isomerization to carvacrol, giving a 1 1 1 mixture of these three substances at 230 °C after 10 min. At 250 °C, for 10 min, carvone isomerized to carvacrol almost quantitatively (Scheme 2.11) [47]. 

Manganese(lll) acetate oxidation of (+)-p-menth-l-ene yields the two lactones (165 X=0, Y = CH2) and (165 X = CH2, Y = O) as major products together with anticipated acetates similar oxidation of (+)-pulegone yields the C-2 acetates in low yield and oxidation of isomenthone in the presence of isopropenyl acetate results in acetonylation at C-2 and C-4. Further examples of the rearrangement of epoxides with KOBu -aprotic solvents (pyridine is favoured) have been reported (c/. Vol. 6, p. 44), e.g. (166) to (167), although with the corresponding 1,2-epoxy-... 

Manganese(lil) acetate oxidation of a-pinene yields two lactones analogous to those reported earlier with (+)-p-menth-l-ene however, the major product consists of derived acetates [of a-terpineol, c/5-pin-3-en-2-ol, and myrtenol (224 ... 

XXXV Benzofuran AICI3 und (—jPhenylalanin in Toluol bei-75°C AICI3, Sii(C2H5)3C1 und (—)Menth-oxytriathylzinn (diisotaktisch) optisch aktiv (diisotaktisch) optisch aktiv (20,66) (95)... 

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