The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 15, 1980
Filed:
Dec. 30, 1976
Hermann Arold, Wuppertal, DE;
Bayer Aktiengesellschaft, Leverkusen, DE;
Abstract
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.