Ru_3(CO)_9(TPPTS)_3催化的水/有机两相芳香硝基化合物CO选择性还原的研究  

Studies of CO Selective Reduction of Aromatic Nitro Compounds in Water/Organic Phases by Using Ru_3(CO)_9(TPPTS)_3

作　　者：梅建庭[1] 蒋景阳[1] 肖启明 李亚明[1] 金子林[1] 

机构地区：[1]大连理工大学精细化工国家重点实验室,大连116012

出　　处：《高等学校化学学报》2000年第6期894-897,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金! (批准号 :2 98760 0 4);教育部博士点科研基金

摘　　要：将水溶性膦 /钌配合物 Ru3( CO) 9( TPPTS) 3( TPPTS:三苯基膦三 -间磺酸钠 )用于以 CO为还原剂的水 /有机两相芳香硝基化合物选择还原为芳胺的反应 ,发现相转移催化剂对反应有明显的促进作用 ,其中以添加十六烷基三甲基溴化铵 ( CTAB)的效果最好 .以邻氯硝基苯为底物考察了相转移催化剂浓度、 Na OH浓度、反应温度、压力等对反应转化率和选择性的影响 .当反应条件为 1 2 0℃ ,4 MPa,3 mol/ L Na OH时 ,反应 8h,邻氯硝基苯的转化率和邻氯苯胺的选择性均可达到 99.9% .而且对含有羰基、氰基的芳香硝基化合物也有很高的活性和选择性 .催化剂循环 3次后 ,邻氯硝基苯的转化率和邻氯苯胺的收率仍可达到 92 %Ru 3(CO) 9(TPPTS) 3 was used in the selective reduction of aromatic nitro compounds under CO atmosphere in water/organic biphase system. It was found that the reaction was accelerated obviously by phase transfer catalysts and the cetyltrimethylammonium bromide(CTAB) is the best one among them. Using o ClC 6H 4NO 2 as a reactant, the influences of the concentration of CTAB, the concentration of NaOH, reaction temperature and CO pressure on the catalytic properties of Ru 3(CO) 9(TPPTS) 3 were studied. Under the conditions of 120 ℃, p co =4 MPa, 3 mol/L NaOH, 8 h, both the conversions of o ClC 6H 4NO 2 and the selectivity of o ClC 6H 4NH 2 were 99.9%. The reductions proceeded with a markable activity and selectivity toward aromatic nitro group as CO, CN groups present in the substrate. After 3 times recycle of the catalyst the conversion of o ClC 6H 4NO 2 and the yield of o ClC 6H 4NH 2 were more than 92%. [WT5HZ]

关 键 词：芳香硝基化合物 CO选择性还原 芳胺 催化还原 

分 类 号：O625.631[理学—有机化学] O625.61[理学—化学]