Production of aminophenols

C - Chemistry – Metallurgy – 07 – C

Patent

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Details

C07C 215/76 (2006.01) C07C 213/08 (2006.01) C07C 217/84 (2006.01) C07C 253/30 (2006.01) C07C 255/59 (2006.01)

Patent

CA 2216043

A method of producing N,N-disubstituted aminophenols of the general formula (see fig.I) or (see fig.II) wherein R1 and R2 are the same or different and each represents a saturated or unsaturated aliphatic hydrocarbyl, cycloalkyl, aralkyl, the phenyl ring of which may be further substituted, alkoxyalkyl, or a cycloalkylalkyl, except that R1 and R2 are not simultaneaously methyl and R' represents hydrogen, halogen, nitro, cyano, alkyl or alkoxy, which comprises reacting an aminophenol of general formul (see fig.III) or (see fig.IV) wherein R3 represents hydrogen or R1, and R' is as defined above, with an organic halide species of general formula R2X wherein R2 is as defined above and X is halogen under aqueous acidic conditions with the periodic addition of an acid trapping agent in such a way that continuous monitoring of pH is not required.

Préparation d'aminophénols avec disubstitution en N,N, de formule générale (voir fig. I) ou (voir fig. II), où R1 et R2 sont les mêmes ou différents, chacun représentant un radical aliphatique, saturé ou insaturé, un cycloalkyle, un aralkyle, dont le phényle peut être avec substitution, un alcoxyalkyle ou un cycloalkylalkyle, excepté que R1 et R2 ne sont pas simultanément un méthyle, R' représente de l'hydrogène, un halogène, un groupe nitro, cyano, alkyle ou alcoxy; on fait réagir un aminophénol de formule générale (voir fig. III) ou (voir fig. IV), où R3 représente de l'hydrogène ou R1, R' étant défini ci-dessus, avec un halogénure organique de formule générale R2X - R2 est défini ci-dessus et X est un halogène dans des conditions aqueuses acides -, avec addition intermittente d'un agent de piégeage d'acide, rendant inutile la surveillance permanente du pH.

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