C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/557
C07C 231/02 (2006.01) C07C 233/43 (2006.01)
Patent
CA 1310019
HOE 88/F 029 Abstract A process for the preparation of 4-acylamino-2-amino- alkoxybenzenes of the general formula (1) Image (1) in which R denotes an alkyl-C1-C6- or alkoxy-C1-C4- alkylene-C1-C4 group and R' denotes a methyl or ethyl group, by pumping a solution or suspension of a 2,4-di- nitroalkoxybenzene of the general formula (2) Image (2) in which R has the abovementioned meaning, in a butyl ace- tate into a stirred suspension of a nickel catalyst on a kieselguhr carrier in butyl acetate, which has been ini- tially introduced into an autoclave, at a hydrogen pres- sure of about 5 to about 50 bar, and a temperature of about 60 to about 120°C, at a rate which corresponds to the rate of hydrogenation of 2,4-dinitroalkoxybenzene to 2,4-diaminoalkoxybenzene, dehydrating the reduction solu- tion by azeotropic distillation, after the hydrogenation, and acylating the resulting 2,4-diaminoalkoxybenzene with about 0.90 to 0.99 mole of the anhydride of an alkylmono- carboxylic acid having 2 to 3 carbon atoms, relative to 1 mole of 2,4-diaminoalkoxybenzene, at about -5 to about +15°C
590714
Heise Hartmut
Hintzmann Manfred
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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