公开(公告)号：DE2311753A1

公开(公告)日：1974-09-12

申请号：DE2311753

申请日：1973-03-09

Applicant: HOECHST AG

Inventor： ALBERS ARNOLD DR ,  KUEMMERLE KELKHEIM DR

IPC: C08G18/48 ,  C07C85/10 ,  C07C147/12

Abstract: Title cpds are prepared by hydrogenating the corresp. nitrobenzenes in aq. phase, using Ni catalysts, and adjusting the pH to 6-7.5 by addn. of oxyacids of 3-or 5-valent P, or of B, CO2 or low-mol. carboxylic acids and strong bases, or the corresp. salts; the additives are metered in such a way that the pH does not fall below the above limit. Nitrobenzenes carrying the above substits. cannot be hydrogenated by previous methods. Only 0.01-10 wt. % Ni catalyst is needed. Lower temps., e.g. 20-120 degrees C, can be used. Aminoacids have esp. strong stabilising effect on the pH.

公开(公告)号：DE2240849A1

公开(公告)日：1974-03-14

申请号：DE2240849

申请日：1972-08-19

Applicant: HOECHST AG

Inventor： KUEMMERLE KURT DR ,  ALBERS ARNOLD DR ,  HILLE ERNST DR ,  HEISE HARTMUT DR

IPC: C08G18/48 ,  C07C85/10

Abstract: Title cpds are prepared by hydrogenating the corresp. nitrobenzenes in aq. phase, using Ni catalysts, and adjusting the pH to 6-7.5 by addn. of oxyacids of 3-or 5-valent P, or of B, CO2 or low-mol. carboxylic acids and strong bases, or the corresp. salts; the additives are metered in such a way that the pH does not fall below the above limit. Nitrobenzenes carrying the above substits. cannot be hydrogenated by previous methods. Only 0.01-10 wt. % Ni catalyst is needed. Lower temps., e.g. 20-120 degrees C, can be used. Aminoacids have esp. strong stabilising effect on the pH.

公开(公告)号：DE2748638A1

公开(公告)日：1979-05-10

申请号：DE2748638

申请日：1977-10-29

Applicant: HOECHST AG

Inventor： PASZTHORY EMMERICH DR ,  ALBERS ARNOLD DR ,  RINGEL ERICH DR ,  ELINKMANN HANS-GERD

IPC: C02F1/74 ,  C02F3/12 ,  C02F11/08 ,  C02C5/04