共查询到20条相似文献,搜索用时 21 毫秒
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室温离子液体促进的5-亚芳基巴比妥酸衍生物的合成 总被引:1,自引:0,他引:1
在室温离子液体1-丁基-3-甲基咪唑四氟硼酸盐([bmim]BF4)存在下, 采用室温研磨和微波辐射的方法, 由芳香醛和巴比妥酸或硫代巴比妥酸经Knoevenagel缩合反应, 制备了相应的5-亚芳基巴比妥酸或5-亚芳烃基硫代巴比妥酸衍生物. 在室温研磨条件下反应2 h, 产率为78%~96%, 在微波辐射功率为160 W时反应20 s, 产率为82%~98%, 产物结构经1H NMR确证. 相似文献
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以4-氯-1-丁醇,N-甲基咪唑和苯甲酸钠为原料,用微波法制得碱性离子液体{[OHBMIM]Ph COO(AIL)},其结构经FT-IR表征;以苯甲醛和苯乙酮为原料,AIL为催化剂,经微波促进的缩合反应合成了查尔酮(1),其结构经1H NMR和FT-IR确证。考察了AIL用量、微波功率、物料比和反应时间对1产率的影响。合成1的最佳反应条件为:AIL 1 mmol,苯甲醛5 mmol,n(苯甲醛)∶n(苯乙酮)=1.1,于微波功率140 W反应5 min,产率95.8%。AIL具有较好的循环使用性,循环使用6次,1产率没有明显降低。 相似文献
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离子液体中乙酸异山梨醇酯的合成 总被引:3,自引:0,他引:3
以1-丁基-3-甲基咪唑六氟磷酸盐离子液体为溶剂,对新一代长效抗心绞痛药物单硝酸异山梨酯中间体异山梨醇进行了萃取分离,避免了使用高真空高温蒸馏;以酸性离子液体N-甲基咪唑硫酸氢盐为溶剂和催化剂,合成了中间体2-乙酸异山梨醇酯,产物结构经红外光谱确证.异山梨醇收率80%,2-乙酸异山梨醇酯收率86%. 相似文献
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Electrochemical Synthesis of Polythiophene in an Ionic Liquid 总被引:6,自引:0,他引:6
Polythiophene(PTh) was prepared by the direct electrochemical synthesis in an ionic liquid ([BMIM]PF6) containing 0.1mol/L thiophene by cyclic voltammetry,constant potential and constant current techniques. It is found that smooth and blue-green PTh films can be obtained at a potential of ca. 1.75V(vs. Ag/AgCl) or a current of ca. 1.5mA cm^-2 in the ionic liquid. 相似文献
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Wen PEI Chen SHEN 《中国化学快报》2006,17(12):1534-1536
Palladium catalyzed arylation or vinylation of olefins by aryl halides are well known as the Mizoroki-Heck reaction and have proved to be of genuine synthetic utility for C-C bond formation1. Although a lot of progress has been made in Heck coupling react… 相似文献
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以N-甲基咪唑、吡啶、1,4-丁烷磺内酯、对甲苯磺酸及硫酸为主要原料,经两步反应合成了4种酸功能化离子液体[MIM-BS][TsO](IL1)、 [MIM BS][HSO4](IL2)、 [PY-BS][TsO](IL3)和[PY-BS][HSO4](IL4),其结构和性能经1H NMR, IR和TGA表征。以[MIM-BS][TsO]为催化剂,催化2-(4-叔丁基苯甲酰基)苯甲酸(BB酸)合成2-叔丁基蒽醌,并对反应条件进行了优化。结果表明:IL1 0.4 g,n(IL)/n(BB酸)=0.5,于120 ℃反应9 h, 2-叔丁基蒽醌产率最高达90%,离子液体循环使用5次后催化活性无明显降低。 相似文献
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采用离子液体热合成法合成新型磷仲钨酸铯杂多酸盐Cs_3PW_(12)0_(40)’系列催化剂并对其物化性能进行了表征.同时以Cs_3PW_(12)0_(40)’-80(简称CsPW’-80)为催化剂, 30%H_2O_2为氧化剂,乙腈为溶剂,以氧化环己醇合成环己酮为催化剂性能测试反应进行催化性能评估.考察了合成催化剂溶剂离子液体占比、催化剂用量、氧化剂用量、反应温度以及反应时间对催化性能的影响.实验结果表明:在合成催化剂离子液体占比为80%、乙腈溶剂5 mL、氧化剂与反应物n(30%H_2O_2)/n(cyclohexanol)=4、反应温度70℃、反应时间8 h的最优条件下,环己醇转化率为100%,环己酮的选择性为98.46%,环己酮总收率达到98.46%. 相似文献
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功能化离子液体室温催化合成乙酸苄酯 总被引:4,自引:1,他引:4
制备了N-甲基-N′-磺酸烷基-咪唑阴离子型功能化室温离子液体,研究了功能化室温离子液体(TSILs)于室温下催化乙酸和苯甲醇反应合成乙酸苄酯的新方法,考察了多种TSILs的催化性能。结果表明,所合成的TSILs具有很高的催化活性,乙酸和苯甲醇的摩尔比为1:1.3,在室温下反应2.5 h,乙酸苄酯的产率可达92%,选择性超过99%。由于生成的乙酸苄酯不溶于催化体系,反应产物与催化体系分层,通过简单的倾析便可实现产物分离,简化了分离过程。离子液体可以循环使用,而其催化活性没有明显降低。 相似文献
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Ionic liquid 1-hexadecyl-3-methylimidazolium bromide [C16mim]Br was synthesized by solvent-free alkylation of N-methylimidzole with hexadecyl bromide. A large transparent single crystal of 1-hexadecyl-3-methylimidazolium bromide monohydrate ([C16mim]Br·H2O), 4 mm in length, was firstly obtained in the water-trichloromethane-toluene growth system (Vwater'Vtrichloromethane'Vtoluene = 0.1:1:2). The crystal structure was determined by single-crystal X-ray diffraction method. It crystallizes in the triclinic system, space group P1, with a = 5.4962(15), b = 7.839(2), c = 27.279(8) A, α = 94.375, β = 91.500, γ = 101.999°, Z = 2, V = 1145.2(5) A3, C20H41BrN2O, Mr = 405.46, Dc = 1.176 Mg/m3, μ = 1.804 mm^-1, F(000) = 436, the final R = 0.0523 and wR = 0.1345. The 3D supramolecular structure is constructed through weak interactions between imidazolium cations, Br- anions and lattice water molecules. The long alkyl chain to the imidazolium ring and lattice water molecules play an important role in the self-assembly process. Moreover, it is proposed that [C16mim]Br in water has aggregation behavior and the possible self-assembled structure is the interdigitated pattern. Finally, thermal stability of [C16mim][Br]·H2O was also studied by DSC and TGA analysis. 相似文献
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A new class of pyrazolone derivatives has been isolated in good to excellent yields from the 2:1 condensation reaction between 3‐methyl‐1‐phenyl‐5‐pyrazolone and arylaldehydes in the presence of ionic liquid [HMIM]HSO4. The compounds were characterised by their IR, NMR spectra, MS and elemental analyses. The important features of the methodology are a wide application range of substrates, higher yields and shorter reaction time. 相似文献
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离子液体促进四氟硼酸铜催化芳醛和乙酸酐合成1,1-二乙酸酯 总被引:5,自引:0,他引:5
在室温条件下, 离子液体1-正丁基-3-甲基六氟磷酸盐([bmim]PF6)能促进四氟硼酸铜催化一系列芳醛和乙酸酐反应, 以83%~97%的产率生成相应的1,1-二乙酸酯. 在离子液体[bmim]PF6存在情况下, 催化剂活性远远高于无离子液体存在下的活性. 催化剂用量仅需 0.2 mol%就能使反应顺利进行, 远远少于文献报道的其它催化剂的用量, 反应在3~20 min内完成. 实验结果表明该法催化剂用量少、产率高、反应时间短、离子液体可重复使用、对环境友好. 相似文献
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