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研究了水/有机两相体系中表面活性剂十六烷基三羟乙基溴化铵(CTHAB)对Rh/TPPTS(TPPTS:三[间-磺酸钠基苯基]膦)催化的1-辛烯氢甲酰化反应的促进作用,初步证实了CTHAB分子中的羟基可与催化活性物种的铑之间发生配位.与传统表面活性剂十六烷基三甲基溴化铵(CTAB)相比,表面活性剂CTHAB的添加不仅加速了水/有机两相1-辛烯氢甲酰化反应,而且提高了成醛的正/异比,促进作用明显.在[Rh]=0.8 mmol/L,[TPPTS]/[Rh]=40,[CTHAB]=4.0mmol/L,90℃,0.5 MPa,1.5 h时,生成醛的TOF为497 h-1,正/异比(L/B)可达25.6.催化剂经7次循环后,反应活性和成醛正/异比无明显下降.该催化体系对不同长链烯烃氢甲酰化反应同样具有促进作用.
The effect of surfactant Cetyltrimethylammoniumethylammonium bromide (CTHAB) on the catalytic activity of Rh / TPPTS (TPPTS: tris [sodium sulfo-phenyl] phosphite) Octene hydroformylation reaction preliminary confirmed that the CTHAB molecule with the active species of rhodium coordination occurs with the traditional surfactant cetyltrimethylammonium bromide (CTAB) In contrast, the addition of surfactant CTHAB not only accelerated the hydroformylation of 1-octene in water / organic phase, but also enhanced the ortho / TOF of aldehydes was 497 h-1, and the ratio of L / B (L / B) was 0.47 mmol / L with [TPPTS] / [Rh] = 40 and [CTHAB] = 4.0 mmol / L at 90 ℃, Up to 25.6.The reactivity of the catalyst and the ortho / isoaldehyde formation did not decrease significantly after 7 cycles of the catalyst.The catalytic system also promoted the hydroformylation of different long-chain olefins.