For the hydrogenatlon of aromatic nitrocompounds, PdCl2 (TPPTS)2-H2PtCl6 ex-hibited much higher catalytic activity than that of PdCl2(TPPTS)2 or H2PtCl6. The synergic effect can also be observed even if the compositio...For the hydrogenatlon of aromatic nitrocompounds, PdCl2 (TPPTS)2-H2PtCl6 ex-hibited much higher catalytic activity than that of PdCl2(TPPTS)2 or H2PtCl6. The synergic effect can also be observed even if the composition of Pt was 2% (molar ratio). A high selec-tivity for the chloroaniline was obtained in the hydrogenation of nitrochlorobenzene catalyzed by PdCl2 (TPPTS)2 and bimetallic catalyst PdCl2 (TPPTS)2-H2PtCl6.展开更多
Ozone mediated nitration of chlorobenzene with nitrogen dioxide over solid acid catalysts is expected to be a green process. The reaction was carried out at ca . 0 ℃. It was found that the solid acid catalysts of SO ...Ozone mediated nitration of chlorobenzene with nitrogen dioxide over solid acid catalysts is expected to be a green process. The reaction was carried out at ca . 0 ℃. It was found that the solid acid catalysts of SO 2- 4/TiO 2 and SO 2- 4/ZrO 2 and a series of SO 2- 4/TiO 2 ZrO 2 catalysts exhibited a fairly good activity for the nitration reaction, whereas SO 2- 4/TiO 2 ZrO 2(atomic ratio 1∶1) gives yield of 62 4% and SO 2- 4/TiO 2 ZrO 2(molar ratio 3∶1) shows a good para selectivity in CH 2Cl 2 solvent. The ortho para isomer ratios( ortho/para ) of the nitration products were varied in range from 1 11 to 0 36. This phenomenon is interpreted in terms of acid amount and acid strength of solid acid catalysts.展开更多
文摘For the hydrogenatlon of aromatic nitrocompounds, PdCl2 (TPPTS)2-H2PtCl6 ex-hibited much higher catalytic activity than that of PdCl2(TPPTS)2 or H2PtCl6. The synergic effect can also be observed even if the composition of Pt was 2% (molar ratio). A high selec-tivity for the chloroaniline was obtained in the hydrogenation of nitrochlorobenzene catalyzed by PdCl2 (TPPTS)2 and bimetallic catalyst PdCl2 (TPPTS)2-H2PtCl6.
文摘Ozone mediated nitration of chlorobenzene with nitrogen dioxide over solid acid catalysts is expected to be a green process. The reaction was carried out at ca . 0 ℃. It was found that the solid acid catalysts of SO 2- 4/TiO 2 and SO 2- 4/ZrO 2 and a series of SO 2- 4/TiO 2 ZrO 2 catalysts exhibited a fairly good activity for the nitration reaction, whereas SO 2- 4/TiO 2 ZrO 2(atomic ratio 1∶1) gives yield of 62 4% and SO 2- 4/TiO 2 ZrO 2(molar ratio 3∶1) shows a good para selectivity in CH 2Cl 2 solvent. The ortho para isomer ratios( ortho/para ) of the nitration products were varied in range from 1 11 to 0 36. This phenomenon is interpreted in terms of acid amount and acid strength of solid acid catalysts.
