共查询到16条相似文献,搜索用时 74 毫秒
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钯催化下共轭烯烃的Heck芳基化是立体选择性形成碳碳键的重要方法,在有机合成中广为应用[1].均相钯催化剂因难以从反应体系中分离回收,其实际应用受到限制.聚合物负载过渡金属催化剂因综合了均相和复相催化过程的优势,已越来越引起人们的关注,聚苯乙烯负载的膦钯配合物能有效地催化共轭烯烃的芳基化[2,3].Zhang等报道了聚合物负载菲咯啉钯(0)配合物催化丙烯酰胺的芳基化[4],但该催化剂的制备过程过于复杂.作者曾报道过聚γ巯丙基硅氧烷钯(0)配合物的合成,并证实其是苯乙烯、丙烯酸Heck芳基化反… 相似文献
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聚-ω-(甲硒基)十一烷基硅氧烷钯(0)配合物的合成与催化性能 总被引:1,自引:0,他引:1
ω-氯代十一烷基三乙氧基硅烷依次用气相法二氧化硅固载、与甲硒基钠和氯化钯作用, 再用水合肼还原, 合成了气相法二氧化硅负载的聚-ω-(甲硒基)十一烷基硅氧烷钯(0)配合物. 该钯(0)配合物对丙烯腈和丙烯酸与芳基碘的Heck芳基化反应具有很高的催化活性, 为各种肉桂腈和肉桂酸的立体选择合成提供了方便实用的新途径. 相似文献
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聚γ-巯丙基硅氧烷钯(0)配合物的合成及催化性能研究 总被引:9,自引:0,他引:9
γ-巯丙基三乙氧基硅烷依次与气相法二氧化硅,氯化钯作用,然后用水合肼还原,合成了新配合物聚γ-巯丙基硅氧烷钯。该配合物是丙烯酰胺及丙烯酸丁酯的Heck芳基化反应的有效催化剂,为立体选择性地2E-不饱酰胺及不饱和酯提供了简便且实用的方法。 相似文献
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以氨基碳酸胍改性氯球为载体, 与氯化钯溶液反应并还原制备氨基胍树脂负载钯(0)催化剂. 对催化剂进行了FT-IR, XRD, BET, TG-DTA表征. 研究了该催化剂对各种取代卤代苯与丙烯酸、苯乙烯的Heck芳基化反应催化性能. 实验结果表明, 该催化剂对活性(吸电子基)溴代苯和碘苯具有良好的催化活性, 对含活性吸电子基的溴代苯(4-溴苯甲醛和4-溴硝基苯)于140 ℃时能在22 min内完成Heck 芳基化反应; 催化剂具有较好的重复使用性能, 在90 ℃下催化碘苯与丙烯酸的反应循环21次时仍能保持良好的催化活性. 反应机理研究表明: 催化反应的活性组分是可溶性钯物种; 可溶性钯是由卤代苯与催化剂表面上的钯氧化加成所致. 相似文献
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A silica-supported arsine palladium(O) complex has been prepared from y-chloropropyltriethoxysilane via immobilization on fumed silica, followed by reaction with potassium diphenylarsenide and palladium chloride, and then reduction with hydrazine hydrate. The complex has been characterized by X-ray photoelectron spectroscopy (XPS) and it is a highly active and stereoselective catalyst for arylation of butyl acrylate and acrylamide with aryl halides, affording a variety of tram-butyl cinnamates and trans-cinnamamides in high yields. 相似文献
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Mingzhong Cai Qiuhua Xu Jianwen Jiang 《Journal of molecular catalysis. A, Chemical》2006,260(1-2):190-196
The first MCM-41-supported thioether palladium(0) complex has been synthesized from 3-(2-cyanoethylsulfanyl)propyltriethoxysilane via immobilization on MCM-41, followed by reacting with palladium chloride, and then the reduction with hydrazine hydrate. It was found that this complex has not only high activity and stereoselectivity for arylation reaction of conjugated alkenes with aryl iodides or activated aryl bromides, but also can efficiently catalyze the arylation reaction of conjugated alkenes with unactivated bromoarenes. This polymeric palladium catalyst can be easily recovered from the products and reused at least 10 times without loss of activity. 相似文献
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Ming Zhong CAI Hong ZHAO Rong Li ZHANG Department of Chemistry Jiangxi Normal University Nanchang Department of Pharmacy Guangdong Pharmaceutical College Guangzhou 《中国化学快报》2005,16(4)
The palladium-catalyzed arylation of alkenes is an important discovery in organo-palladium chemistry made by Heck et al. and has found wide application in organicsynthesis1,2. In this reaction, homogeneous palladium complexes such as Pd(OAc)2 areusually used as the catalysts and the amount of catalyst used is about 2 mol% of reactant.Although homogeneous palladium catalysts have proven to be efficient, their activity andstereoselectivity are moderate and use of homogeneous palladium catalysts… 相似文献
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钯系催化剂的制备及其在催化氢化中的应用 总被引:7,自引:2,他引:7
钯系催化剂的制备及其在催化氢化中的应用陈一飞,丘礼元,李和兴(上海师范大学化学系上海200234)关键词钯络合催化剂,镍一钯复合催化剂,催化氢化脂肪烯烃和芳烃硝基衍生物种类繁多,其氢化产物广泛应用在食品工业、染料工业、高分子工业以及日用化工等领域。合... 相似文献
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Silica-bound mercaptoselenaether-containing silsesquioxane and its plat-inum or rhodium complex were synthesized from γ-(2,3-epithiopropyl) propyltrimethoxysi-lane via ring-opening reaction with bis(2-hydroxyethyl) sclenide, followed by hydrolysisand immobilization on fumed silica, and then reacting with potassium chloroplatinite orrhodium chloride in acetone under nitrogen atmosphere. It was found that two noble metalcomplexes can catalyze the hydrosilylation of olefins with triethoxysilane effectively. Theinfluences of temperature, the amount of complex used, the nature of olefin on catalyticactivity were investigated. 相似文献