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)丁酮的过程,该物质是一种受欢迎的天然芳香物质,从易得的起始材料中制备出纯形式和高产率的产物。在碱性条件下,将4-叔-烷氧基苯甲醛缩合,得到一种新型的1-(4-叔-烷氧基苯基)-丁-1-烯-3-酮,后者在缩合期间或之后被氢化,得到一种新型的1-(4-叔-烷氧基苯基)-丁酮,然后在酸的催化下,从该化合物中消除异丁烯或2-甲基丁-1(2)-烯。新型中间体的一般式为##STR1##其中R为H或CH.sub.3,虚线可以是一个额外的碳-碳键,也可能不是。