共查询到18条相似文献,搜索用时 156 毫秒
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胺基化树脂负载Pd(0)对Heck反应催化性能的研究 总被引:7,自引:0,他引:7
将氯球用胺化剂、乙二胺、胍进行胺化后负载氯化钯, 在乙醇溶液中用硼氢化钾还原, 制备了含胺功能基树脂负载钯(0)的催化剂; 研究了催化剂对含各种取代基碘代苯与丙烯酸的Heck芳基化反应催化性能. 结果表明, 该类催化剂具有良好的催化活性和重复使用性能, 其中用乙二胺功能化树脂负载的Pd(0)催化剂在90 ℃重复使用17次时能保持良好的催化活性. 催化剂反应前后的SEM形貌图和过滤液的活性试验表明催化剂活性组分Pd(0)在反应中有沥取(leaching)现象. 相似文献
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首次报道用离子交换树脂D296为载体,制备的D296树脂分散钯催化剂/甲酸铵还原体系,催化氢转移还原取代芳香硝基化合物成芳胺的方法。该法反应条件温和,操作简便,催化剂可重复使用,收率可达83~94%。 相似文献
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通过大孔苯乙烯-二乙烯苯共聚体的硝化、还原和重氮化反应制得的交联聚苯乙烯重氮盐分别同取代酚(或芳香胺)羧酸或磺酸化合物(如水杨酸、对羟基苯甲酸、2,4-二羟基苯甲酸、没食子酸、2-羟基-3-羧基萘、磺基水杨酸、对氨基苯磺酸、4-羟基萘磺酸)和水杨醛等进行偶合反应制得了一类新型阳离子交换树脂。另外,还研究了反应介质的pH值和偶合试剂的结构等因素对偶合反应的影响。合成的离子交换树脂对铜离子和铁离子等有良好的选择性和对某些维生素和抗菌素有好的吸附-解吸性能。 相似文献
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CO2的固定和转化具有重要研究意义,特别是采用廉价且良好生物相容性的金属催化剂将其转化为有用的有机化合物.本工作报道采用商品化ZnEt2(1.0 mol%)可促进CO2的硅氢化反应生成甲氧基硅醚,以及CO2为C1合成子的有机胺甲酰化或脲化反应生成酰胺或脲类化合物.在1.0 mol% ZnEt2存在下,CO2和(EtO)3SiH发生硅氢化反应,一锅选择性还原为甲氧基硅醚(CH3OSi(OEt)3).考察了反应条件的影响,在1.0 MPa CO2起始压力下,90℃反应7 h,甲氧基硅醚的产率达到约90%.当上述反应体系中存在有机胺时,则发生了CO2为C1合成子的的有机胺甲酰化或脲化反应.当采用二级有机胺为底物时,反应生成酰胺类产物;当一级有机胺为底物时,反应主要生成脲类产物.考察了反应底物取代基的影响,含脂肪基和芳香基的二级有机胺均可发生甲酰化反应,芳香基的对位含给电子取代基时明显有利于该甲酰化反应.含脂肪基和芳香基的一级有机胺均可发生脲化反应,芳香基对位取代基的电子性质对脲化反应的影响规律不如在甲酰化反应中的明显. 相似文献
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芳香胺和酚溴化的新工艺 总被引:1,自引:0,他引:1
研究了在室温下,N-溴丁二酰亚胺对芳香胺和酚的溴化工艺,在CHCl3、EtOH或EtOH/CHCl3溶剂中,用等摩尔的N-溴丁二酰亚胺可将某些芳香胺和酚(考察了5种反应底物)选择性地一溴化,产率92%~98%,N-溴丁二酰亚胺和反应底物摩尔比为2∶1;某些芳香胺和酚被专一地二溴化(考察了5种反应底物),产率90%~97%。 反应无须催化剂,投料后室温搅拌,反应条件温和,产品只需过滤洗涤即可纯化,操作简便。 相似文献
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以水为反应介质、NBS为氧化剂,在水相无催化剂条件下实现了醇的氧化.芳香醇、脂肪醇都可以达到95%以上的醛(或酮)产率,但该体系对一些含供电子取代基的醇的反应活性不高,选用salen-Co(Ⅲ)配合物作为催化剂,可拓宽反应的底物适用范围. 相似文献
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Warren T. Ford Glenn H. Beasley Berni P. Chong James W. Neely 《Journal of polymer science. Part A, Polymer chemistry》1982,20(5):1213-1229
Carbonaceous adsorbents are obtained by thermolysis of sulfonated macroreticular polystyrene ion exchange resins at 300-500°C. The hard, spherical, carbonaceous particles react exothermally with elemental chlorine to form products containing up to 38% Cl. The chlorinated particles react readily with polyamines to form anion exchange resins with capacities of up to 2.2 meq/g dry resin. Less than 60% of the nitrogen atoms in the particles are utilized as ion exchange sites. The carbonaceous particles can also be chloromethylated with chloromethyl methyl ether or chlorinated with sulfuryl chloride and then aminated with polyamines to form anion exchange resins, sulfonated with sulfuric acid or chlorosulfonic acid to form strongly acidic cation exchange resins, or chlorosulfonated and then aminated with polyamines to form anion exchange resins. Model structures of the thermolyzed resins containing polycyclic aromatic hydrocarbon fragments are proposed to explain their chemical reactivities. 相似文献
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《Journal of membrane science》1998,149(2):163-169
The anion exchange membrane was prepared by conducting the formation of macroreticular structure and the introduction of ion exchange groups to the chloromethylated copolymers simultaneously. The membrane properties are summarized below; 0.9–1.4 Ω cm2 for area resistivity in 2 M KCl aqueous solution, 1.46–3.7 meq/g-dry-resin for the ion exchange capacity and 0.68–0.87 for the static transport number. The membrane properties of the membrane prepared by forming the macroreticular structure and the introduction of the ion exchange groups to the chloromethylated copolymers simultaneously (B membrane) had higher performance than that of the membrane prepared by the amination of the chloromethylated copolymers (A membrane). It would be expected that the formation of macroreticular structure in the membrane has an effect on the membrane properties. The chemical stability of B membrane which was determined by the oxidative degradation in 2 M nitric acid, had long lifetime with almost the same value of the area resistivity and ion exchange capacity as before durability test. 相似文献
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本文用硝酸一步法将大孔氯甲基化交联聚苯乙烯树脂小球(氯球)氧化成聚乙烯基苯甲酸树脂。经红外光谱鉴定,推测了反应的机理。 相似文献
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报道了一种制备聚苯乙烯紫精树脂的新方法,首先将氯甲基化聚苯乙烯树脂与4,4'-联吡啶反应,交吡啶结构引入树骨架,然后与氯化苄反应得到含紫精结构的树脂,将所得树脂作为电子转移催化剂应用于邻氯硝基苯还原。结果表明:含紫精结构的树具有在室温下诱导邻氯硝基苯还原生成邻氯苯胺的功能,催化活性与其结构有关,树脂可重复使用。 相似文献
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STUDYONTHESEPARATIONOFGLUTAMICACIDBYION-EXCHANGEShenJinyu;WangQinyu(DepartmentofChemicalEngineering,TsinghuaUniversity,Beijin... 相似文献
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Ion-exchange resins have been often used as catalysts especially those based on styrene-divinylbenzene copolymers with sulfonic acid groups in the aromatic rings of polymer chains. That is due to the advantages of heterogenous catalysis over the homogeneous acid catalysis. Moreover, resin catalysts can often lead to high selectivity in organic reactions due to the matrix effects. Therefore, the study of copolymers synthesis conditions to determine the type of polymer structure produced as well as the characterization of sulfonic resins obtained thereof are of great interest. The current paper describes the synthesis, characterization and evaluation as catalysts of sulfonic resins derived from polymer supports synthesized by aqueous suspension polymerization of styrene and divinylbenzene. The reaction conditions were varied and polymer supports with different physical properties and morphological characteristics were obtained. The polymer supports were chemically modified by sulfonation. The resultant sulfonic resins had their catalyst activity evaluated in the esterification of acetic acid with n-butanol. 相似文献
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《Journal of molecular catalysis. A, Chemical》2000,151(1-2):245-252
The preparation of a variety of catalysts obtained by ion exchange of the complex [(dppb)Pt(μ−OH)]22+ with sulfonated styrene–divinylbenzene copolymers is reported. Copolymers used are commercial ion exchange resins containing either 4% or 20% DVB and they were loaded with either Li+ or NBu4+ prior to exchange with the Pt complex. Metal loading in the heterogenized catalysts is in the range 2–8% by weight. Their catalytic properties in the Baeyer–Villiger oxidation of methylcyclohexanone with hydrogen peroxide appear to be best in terms of activity and productivity either in neat ketone or in EtOH as the solvent. The use of commercial resins with high exchange capacity prevents the use of DCE as the solvent, i.e., the optimum conditions for the homogeneous system, thereby leading to activities and productivities that are generally lower than their homogeneous counterpart. A discussion on the influence of the philicity properties of the support with respect to the performance of the catalyst is reported. 相似文献