| abstract |
PURPOSE: To prepare the titled compound useful as a perfumery component of perfume, etc., easily, in high selectivity, by reducing easily and inexpensively available 4-methyl-5,6-dihydro-2H-pyran with metallic A1, and treating the product with a proton donor solvent. n CONSTITUTION: 4-Methyl-5,6-dihydro-2H-pyran of formula I is reduced with metallic A1 at 100W200°C for several hours to about 1 day in the presence of mercury halide such as HgCl 2 . In the above reaction, an alkyl halide such as CH 3 I and/ or a metalic halide such as ZnCl 2 which is a Lewis acid are added to the system to impove efficiency of the reaction. The obtained reaction product is treated with a proton donor solvent preferably water to effect the hydrolysis or solvolysis and obtain the objective compound of formula II. n USE: A perfumery component of perfume or an adjuvant to modify or promote the aroma of other perfumery component, and their synthetic intermediate. n COPYRIGHT: (C)1984,JPO&Japio |