| 摘要 |
1,132,600. 2,3-Dihydrofuran derivatives. R. FIRMENICH, G. FIRMENICH, R. E. FIRMENICH, and F. H. FIRMENICH, [trading as FIRMENICH & CIE1]. 29 Dec., 1965 [31 Dec., 1964], No. 55137/65. Heading C2C. [Also in Division A2] Compounds of the formula where R is hydrogen or an alkyl group of 1 or 2 carbon atoms, the latter compounds being novel, or precursors of such a compound where R is hydrogen, for example the lower fatty acid esters, such as the formate and novel acetate, which are readily saponifiable to the free compound, are employed to provide a strawberry flavour. 2,5 - Dimethyl - 4 - hydroxy - 2,3 - dihydrofuran-3-one is prepared by heating a mixture of rhamnose monohydrate, piperidine and acetic acid, in absolute ethanol. The methyl ether is obtained by treating a solution of 2,5-dimethyl-4-hydroxy-2,3-dihydrofuran-3- one in methanol with diazomethane. The acetate of 2,5-dimethyl-4-hydroxy-2,3-dihydrofuran-3-one is obtained by reaction with acetic anhydride in pyridine. |
