Process for the preparation of pure 2-ethylamino-4-nitro-1-alkoxybenzenes
申请人:Hoechst Aktiengesellschaft
公开号:US04612396A1
公开(公告)日:1986-09-16
A process for the preparation of pure 2-ethylamino-4-nitro-1-alkoxybenzenes of the formula (1) ##STR1## in which R denotes an alkyl(C.sub.1 -C.sub.4) or alkoxy(C.sub.1 -C.sub.4)-alkyl(C.sub.1 -C.sub.4) group, which comprises N-monoalkylation of 2-amino-4-nitro-1-alkoxybenzenes of the formula (2) ##STR2## in which R has the abovementioned meaning, using a slight excess of diethyl sulfate in non-polar, organic solvents in the absence of water at temperatures of about 40.degree. to about 120.degree. C.