Aprocess for producing p,p'-biphenol which comprises heating a 4,4'-bis(substituted phenol) at elevated temperatures below the decomposition temperature of p,p'-biphenol in the absence of a catalyst under an inert non-reactive atmosphere for the length of time sufficient to obtain a reaction product containing a substantial amount of p,p'-biphenol while removing the olefin by-product formed and then recovering the p,p'-biphenol product.
The 4,4'-bis (substituted phenol) is made by oxidative coupling of a phenol having the formula
wherein R, and R2 may be the same or different and is a member selected from the group consisting of alkyl radicals containing from 2 to 10 carbon atoms, aralkyl radicals containing from 8 to 10 carbon atoms and having a β alkyl carbon - hydrogen group, and cyclic alkyl radicals having a /3 alkyl carbon - hydrogen group with oxygen or an oxygen containing gas in the presence of a catalytic quantity of a catalyst selected from the group consisting of alkali metal hydroxides, alkali metal salts of a weak acid, alkaline earth metal hydroxides, alkaline earth metal salts of a weak acid, amine bases, and mixtures of the same at an elevated temperature forthe time necessary to react up to a stoichiometric amount of oxygen with said phenol to form a reaction product containing a substantial amount of 4,4'-bis(2,6,-disubstitutedphenol).
一种生产p,p'-联
苯酚的工艺,包括在没有催化剂的情况下,在惰性非反应气氛下,在低于p,p'-联
苯酚分解温度的高温下加热4,4'-双(取代
苯酚),加热时间足以获得含有大量p,p'-联
苯酚的反应产物,同时除去形成的烯烃副产物,然后回收p,p'-联
苯酚产物。
4,4'-双(取代
苯酚)是通过氧化偶联具有以下式子的
苯酚制得的
其中 R 和 R2 可以相同或不同,并且是从以下组成的组中选出的成员:含 2 至 10 个碳原子的烷基、含 8 至 10 个碳原子并具有一个 β 烷基碳氢基的芳烷基和具有一个 /3 烷基碳氢基的环状烷基、弱酸的碱
金属盐、碱土
金属氢氧化物、弱酸的碱土
金属盐、胺碱和它们的混合物,在升高的温度下,在必要的时间内,与所述
苯酚反应,生成含有大量 4,4'-双(2,6,-二取代
苯酚)的反应产物。