申请人:——
公开号:US03946086A1
公开(公告)日:1976-03-23
A method of producing 2,6-dialkyl- and 2,6-diaralkyl-substituted derivatives of p-cresol of the general formula ##SPC1## Wherein R signifies an alkyl group having from 4 to 12 carbon atoms or ##SPC2## Comprising subjecting phenol to alkylation with olefines having from 4 to 12 carbon atoms or with styrene at a temperature of 50.degree.-150.degree.C in the presence of a catalyst, namely, aluminum, taken in an amount of 0.1-5 wt.% of phenol. 2,6-Dialkyl phenol or 2,6-diaralkyl phenol resulting after from the alkylation is treated with a mixture of formaldehyde and dimethylamine or with a product of their interaction having the formula ##EQU1## at a temperature of 20.degree.-100.degree.C with subsequent catalytic hydrogenolysis of N,N-dimethyl(3,5-dialkyl-4-hydroxybenzyl)/amine or N,N-dimethyl(3,5-diaralkyl-4-hydroxybenzyl/amine at a temperature of 80.degree.-200.degree.C., molar ratio of hydrogen to the product being treated of 1-5:1 and space velocity of 0.1-2 hour.sup..sup.-1. The products produced by said method feature a high degree of purity, and they can be employed as effective inhibitors of thermooxidation degradation of polymers and hydrocarbon fuels, and also as intermediates for producing p-cresol, and 2-alkyl- and 2-aralkyl-substituted derivatives of p-cresol.
一种生产具有通用公式##SPC1##的2,6-二烷基和2,6-二芳烷基取代对甲酚衍生物的方法,其中R表示具有4至12个碳原子的烷基团或##SPC2##包括将酚与具有4至12个碳原子的烯烃或苯乙烯在50至150摄氏度的温度下进行催化烷基化,所述催化剂为铝,其用量为酚的0.1-5重量%。经过烷基化后得到的2,6-二烷基酚或2,6-二芳烷基酚与甲醛和二甲胺的混合物或具有公式##EQU1##的它们相互作用产物在20至100摄氏度的温度下处理,随后在80至200摄氏度的温度下催化氢解N,N-二甲基(3,5-二烷基-4-羟基苄基)/胺或N,N-二甲基(3,5-二芳烷基-4-羟基苄基)/胺,氢与被处理产物的摩尔比为1-5:1,空间速度为0.1-2小时^-1。所述方法生产的产品具有高纯度,它们可用作聚合物和碳氢燃料热氧化降解的有效抑制剂,也用作生产对甲酚以及2-烷基和2-芳烷基取代对甲酚衍生物的中间体。