申请人:Bayer Aktiengesellschaft
公开号:US04212822A1
公开(公告)日:1980-07-15
In the preparation of an o-dialkylaminomethylphenol of the formula ##STR1## in which R.sup.1 and R.sup.2 each independently is alkyl with 1 to 6 carbon atoms, or R.sup.1 and R.sup.2 conjointly with the adjacent nitrogen atom, form a five-membered or six-membered ring, by reacting phenol, formaldehyde or paraformaldehyde and an amine of the formula ##STR2## the improvement which comprises carrying out the reaction in the presence of an organic liquid which is immiscible with water but which is a solvent for the phenol and amine employed as starting materials and the o-dialkylaminomethylphenol which is formed. Advantageously the amine is dimethylamine or diethylamine, the organic liquid is a member selected from the group consisting of cyclohexane, methylcyclohexane, methylene chloride, chloroform, carbon tetrachloride, ethylene chloride, diethyl ether, dipropyl ether, dibutyl ether, dipentyl ether, methyl butyl ether, ethyl propyl ether, diisopropyl ether and di-isobutyl ether, the reaction is effected at about 10.degree. to 70.degree. C., about 1.1 to 2 moles of phenol, about 1 mole of formaldehyde and about 2.5 to 3.5 moles of the organic liquid, after the reaction the by-product water is separated from the organic liquid containing the o-dialkylaminomethylphenol, the organic liquid is separated from the o-dialkylaminomethylphenol, and the organic liquid is recycled for further reaction.
在制备公式为##STR1##的o-二烷基氨甲基苯酚中,其中R.sup.1和R.sup.2分别独立为1至6个碳原子的烷基,或者R.sup.1和R.sup.2与相邻的氮原子共同形成五元环或六元环,通过反应苯酚、甲醛或多聚甲醛和公式为##STR2##的胺,改进的方法包括在不与水混溶但是是苯酚和胺的溶剂以及形成的o-二烷基氨甲基苯酚的有机液体中进行反应。优选的胺是二甲胺或二乙胺,有机液体是从环己烷、甲基环己烷、氯甲烷、氯仿、四氯化碳、乙烯氯、二乙醚、二丙基醚、二丁基醚、二戊基醚、甲基丁基醚、乙基丙基醚、二异丙基醚和二异丁基醚中选择的一种,反应在约10℃至70℃之间进行,使用约1.1至2摩尔的苯酚,约1摩尔的甲醛和约2.5至3.5摩尔的有机液体,在反应后,将副产水与含有o-二烷基氨甲基苯酚的有机液体分离,将有机液体与o-二烷基氨甲基苯酚分离,并将有机液体回收进行进一步反应。