申请人:BASF Aktiengesellschaft
公开号:US04908481A1
公开(公告)日:1990-03-13
A simple process for preparing 1-(4-hydroxy-phenyl)-butan-3-one, a sought-after natural aromatic, in a pure form and in good yield from easily accessible starting materials, wherein a 4-tert-alkoxy-benzaldehyde is condensed, under alkaline conditions, to give a novel 1-(4-tert.-alkoxy-phenyl)-but-1-en-3-one, the latter is hydrogenated, during or after this condensation, to give a novel 1-(4-tert.-alkoxy-phenyl)-butan-3-one, and isobutene or 2-methyl-but-1(2)-ene is eliminated from this compound in the presence of a catalytic amount of an acid. The novel intermediates have the general formula ##STR1## where R is H or CH.sub.3 and the broken line may or may not be an additional carbon-carbon bond.
一种简单的制备1-(4-羟基苯基)-丁酮的方法,该天然芳香物质易于获得,纯度高,收率好,其方法包括将4-叔-烷氧基苯甲醛在碱性条件下缩合,形成一种新的1-(4-叔-烷氧基苯基)-丁-1-烯-3-酮,然后在此缩合过程中或之后,对该中间体进行氢化,得到一种新的1-(4-叔-烷氧基苯基)-丁酮,并在存在催化酸的情况下,从该化合物中消除异丁烯或2-甲基-丁-1(2)-烯。新的中间体具有一般式##STR1##其中R为H或CH.sub.3,虚线可以是另一个碳-碳键或不是。