Partial Reduction of Dinitroarenes to Nitroanilines with Hydrazine Hydrate
作者:Nagaraj R. Ayyangar、Uttam R. Kalkote、Ananda G. Lugade、Pandurang V. Nikrad、Vasant K. Sharma
DOI:10.1246/bcsj.56.3159
日期:1983.10
such as hydroxyl and amine groups could be conveniently reduced with 3 molar equivalents of hydrazinehydrate in presence of Raneynickelcatalyst in ethanol/1,2-dichloroethane solvent mixture to give a product wherein one of the two nitro groups was reduced to the amino group. The yields of the partial reduction products are good. Under similar conditions alkoxyl substituents in the o,p-position to the
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.