共查询到20条相似文献,搜索用时 46 毫秒
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离子液体独特的溶剂性能使它在合成和催化领域得到了广泛的应用。然而,离子液体的经济问题和可能的环境友好性问题使得人们逐渐把目光投向了离子液体自身的催化性能。人们通过对离子液体结构的修饰设计出了各种具有特定催化性能的功能化离子液体。近年来功能化离子液体在催化碳-杂键形成反应方面有了相当多的应用。本文以形成的碳-杂原子键类型为主线,综述了功能化离子液体在催化碳-杂键形成反应方面的最新研究进展,涉及到了酸性离子液体、碱性离子液体、金属有机功能化离子液体、酸碱双功能离子液体、手性离子液体等多种类型的功能化离子液体。 相似文献
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室温离子液体催化“一锅法”合成3, 4-二氢嘧啶-2-酮 总被引:17,自引:0,他引:17
利用室温离子液体作催化剂,芳香醛、尿素和乙酰乙酯或乙酰丙酮三组分缩合制备3,4-二氢嘧啶-2-酮衍生物,反应条件温和,反应时间短,且不需另加有机溶剂,考察了不同取代基对芳香醛、尿素和乙酰乙酸乙酯或乙酰丙酮三组分缩合反应的影响。还考察了不同的室温离子液体的催化性能,发现1-丁基-3-甲基咪唑六氟磷酸盐较1-丁基-3-甲基咪唑四氟硼酸盐的催化效果略好。 相似文献
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发展了在非卤素绿色离子液体1-丁基-3-甲基咪唑离子液体乳酸盐中制备纳米Pd催化剂的简便化学方法.透射电镜结果表明,Pd纳米粒子高度分散在[Bmim]Lac离子液体中,平均粒径为2.2–3.1 nm.Pd纳米粒子的大小随着体系中[Bmim]Lac与Pd(OAc)2摩尔比减小和温度升高而增大.考察了离子液体稳定纳米Pd催化剂(PdNPs@[Bmim]Lac)催化Heck-Mizoroki反应性能,并对反应条件进行了优化.结果表明,所制备的离子液体稳定的纳米Pd催化剂在优化条件下可高效催化系列卤代芳烃与烯烃的Heck-Mizoroki反应,且可循环使用6次. 相似文献
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合成了一系列Br(o)nsted酸性离子液体并将其应用在醛醇缩合反应中.醛醇缩合产物由于极好的溶剂性质等被广泛用作溶剂和试剂.离子液体[BSmim][OTf]在甲醛和乙二醇缩合生成1,3-二氧五环的反应中表现出了极好的催化活性,甲醛转化率和主产物1,3-二氧五环选择性分别可以达到96.1%和92.4%.对影响离子液体催化性能的因素进行了探索,并对催化反应中的离子液体的用量、反应温度、反应时间以及反应物料比进行了考察.通过Hammett酸度函数法测定了所用到离子液体的酸性,结果表明离子液体酸性与其在缩合反应中的催化活性顺序完全一致,酸性越强催化性能越好.结合实验给出了离子液体[BSmim][OTf]催化甲醛和乙二醇缩合反应的可能的反应机理.该催化剂体系具有良好的催化性能,反应可以在较温和的条件下进行,实现了高活性和高选择性的目标,产物易分离,催化剂重复使用7次,其催化活性基本不变.并将该Br(o)nsted酸性离子液体进一步应用到其他醛(酮)醇缩合反应中. 相似文献
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The approaches to synthesis of 1-phenyl-1-halo-1-silacyclohexanes C5H10Si(Ph)X (X = F, Cl, Br) have been examined. 1-Phenyl-1-chloro-1-silacyclohexane has been prepared via the known reaction of phenyltrichlorosilane with dimagnesium derivative of 1,5-dibromopentane; up to 20% of 1-bromo-1-phenyl-1-silacyclohexane admixture is formed along with the target product. The minor product formation has been prevented using an alternative method of chlorination of 1-phenyl-1-silacyclohexane with N-chlorosuccinimide. 1-Phenyl-1-fluoro-1-silacyclohexane has been obtained in close to quantitative yield via the reaction of 1-phenyl-1-chloro-1-silacyclohexane with SbF3 and in 70% yield via its reaction with HF. The synthesis of 1-phenyl-1-bromo-1-silacyclohexane via bromination of 1-phenyl-1-chloro-1-silacyclohexane with N-bromosuccinimide has given the target product as a minor one, the major product being disiloxane formed due to hydrolysis of the Si–Br bond. 相似文献
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Daniel A. Ruddy Donald H. Berry Chip Nataro 《Journal of organometallic chemistry》2008,693(1):169-172
New synthetic routes to 1-methyl-1-silaindane (1b) and 1-methyl-1-germaindane (1b) were developed and the desired products were obtained in good isolated yield. Compounds 1a and 1b were fully characterized by mass spectroscopy, 1H and 13C{1H} NMR, and infrared spectroscopy. 相似文献
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《Tetrahedron letters》1987,28(24):2693-2696
The title compounds are prepared by reaction of disubstituted diazomethanes with 1-chloro-2-phenyl-2-trimethylsilyl-1-phosphaalkene. The chemistry of the 1-chloro-1-phosphiranes is described. 相似文献
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Conclusions The synthesis of some nuclear-substituted derivatives of 1-phenyl-1-methyl-1-silacyclobutane by the reaction of 1-methyl-1-chloro-1-silacyclobutane with the appropriate arylmagnesium bromides was described.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 7, pp. 1686–1688, July, 1978. 相似文献
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M. G. Voronkov O. G. Yarosh Z. G. Ivanova V. K. Roman A. I. Albanov 《Russian Chemical Bulletin》1987,36(6):1297-1299
Conclusions We synthesized 1-methyl-1-ethynylsilacyclopentane, which is the first reported 1-ethynylsilacycloalkane. The reactivities of this silahydrocarbon and its magnesium bromide derivative were studied.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 6, pp. 1403–1406, June, 1987. 相似文献
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