申请人:Hoechst Aktiengesellschaft
公开号:US05395978A1
公开(公告)日:1995-03-07
Process for preparing hydroxybenzaldehydes of the formula (1) ##STR1## in which R.sup.1 -R.sup.4 are hydrogen, fluorine, chlorine, bromine, alkyl, alkoxy, phenyl, naphthyl, phenylalkyl, naphthylalkyl, phenoxy or saturated or unsaturated cyclopentane or cyclohexane radicals, and R.sup.1 -R.sup.4 may with the hydroxybenzene ring carbon atoms on which they are located form 1 or 2 saturated or unsaturated isocyclic or heterocyclic rings, by admixing 1 mol of a phenol of the formula (2) ##STR2## in which R.sup.1 -R.sup.4 have the stated meanings, in a pressure vessel with from 5 to 100 mol of hydrogen fluoride and from 0.5+x to 1.5+x mol of boron trifluoride, where x is the number of oxygen atoms contained in the starting compound (formula (2)), setting the mixture to from -10.sup..degree. to 100.degree. C. and then passing carbon monoxide into this mixture until a pressure of from 10 to 150 bar is reached and allowing the mixture to react at the desired pressure reached.
制备化学式(1)中的羟基苯甲醛的方法,其中R.sup.1-R.sup.4是氢、氟、氯、溴、烷基、烷氧基、苯基、萘基、苯基烷基、萘基烷基、苯氧基或饱和或不饱和环戊烷或环己烷基,而R.sup.1-R.sup.4可能与它们所在的羟基苯环碳原子形成1个或2个饱和或不饱和的异环或杂环,方法包括将化学式(2)中的酚的1摩尔与5至100摩尔氢氟酸和0.5+x至1.5+x摩尔三氟化硼混合在一个加压容器中,其中x是起始化合物(化学式(2))中含有的氧原子数,将混合物设置在-10℃至100℃,然后向该混合物通入一氧化碳,直到达到10至150巴的压力,并允许混合物在达到所需压力时反应。