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    • 5. 发明授权
    • Process for the preparation of d,1-menthol
    • 制备d,1-薄荷醇的方法
    • US5300706A
    • 1994-04-05
    • US28850
    • 1993-03-10
    • Otto ImmelGerhard DarsowHans-Josef Buysch
    • Otto ImmelGerhard DarsowHans-Josef Buysch
    • B01J23/656B01J27/055C07B61/00C07C29/20C07C35/12C07C29/00C07C29/17
    • C07C35/12
    • A process for the preparation of d,l-menthol by catalytic hydrogenation of aromatic or partly hydrogenated cyclic compounds which have the carbon skeleton of menthol having at least one double bond and are substituted by oxygen in the 3-position relative to the methyl group, with simultaneous rearrangement of optically active or inactive stereoisomers of menthol at elevated temperature and under pressure is described. The hydrogenation, which is to be carried out continuously, is carried out on a fixed bed catalyst which comprises, as active constituents, palladium, ruthenium or rhodium or a mixture of these elements, and comprises alkali metal hydroxides and/or alkali metal sulphates as promoters; the support for this catalyst is doped with a rare earth metal and manganese.
    • 一种通过芳香族或部分氢化的环状化合物的催化氢化制备d,l-薄荷醇的方法,其具有至少一个双键的薄荷醇的碳骨架并相对于甲基在3-位上被氧取代, 描述了在升高的温度和压力下同时重新配置薄荷醇的光学活性或无活性立体异构体。 要连续进行的氢化在固定床催化剂上进行,固定床催化剂包含作为活性组分的钯,钌或铑或这些元素的混合物,并且包括碱金属氢氧化物和/或碱金属硫酸盐作为 发起人; 该催化剂的载体掺杂有稀土金属和锰。