The invention deals with a process of preparation of 4-(a-alkyl-a-cyano-methyI)2,6-di-substituted phenols having the formula
wherein R is hydrogen, methyl, ethyl, n-propyl or isopropyl and R, and R2 are the same or different monovalent substituent selected from the group consisting of alkyl, aralkyl and cyclic alkyl radicals. These phenols are prepared by reacting a di-substituted phenol having the formula
wherein R, and R2 are as defined above with an aliphatic aldehyde having a single aldehyde radical selected from formaldehyde, acetaldehyde, propionaldehyde or butryal- dehyde and an alkali metal cyanide or an alkaline earth metal cyanide in a suitable solvent.
The phenols in question are useful for preparing a-alkyl-4-hydroxyoxyphenyl-acetic acids.
本发明涉及一种制备 4-(a-烷基-a-
氰基-甲基)2,6-二取代
苯酚的工艺,其式为
其中 R 是氢、甲基、乙基、正丙基或异丙基,R 和 R2 是选自烷基、芳烷基和环烷基的相同或不同的单价取代基。这些
苯酚的制备方法是将具有以下式子的二取代
苯酚进行反应
其中 R 和 R2 如上文所定义,具有一个选自
甲醛、
乙醛、
丙醛或
丁醛的醛基的脂族醛与碱
金属
氰化物或碱土
金属
氰化物在合适的溶剂中反应。
所述
苯酚可用于制备 a-烷基-
4-羟基
苯乙酸。