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聚合物支载的不对称有机合成 总被引:3,自引:0,他引:3
聚合物支载的不对称有机合成比相应的小分子合成体系有独特的优越性。本文综述了近10年来取得了较大进展的聚合物支载的不对称有机合成体系。 相似文献
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本文评述了利用聚合物支载的Wittig试剂、Wittig-Horner试剂、保护试剂和基团消除法合成烯类化合物。 相似文献
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聚合物支载的甘氨酸与Cu^2+离子的络合性能 总被引:7,自引:0,他引:7
本文用N-(3-聚苯乙烯磺酰基-2-羟基丙基)甘氨酸为模型,研究了聚合物支载的氨基酸与Cu2 离子的络合作用性能。树脂与铜离子络合的介质最佳pH值在2~3之间。按照方程:-1n(1-F)=KTt处理求得吸附速率下数K288=2.47X10-4sec-1。根据Boyd液膜扩散理论,这一吸附过程主要受液膜扩散控制。而且这个反应过程是一种Freundlish吸附过程。G=-30.91KJ/mole和S=129.90J/moleK表明,吸附反应是自发进行的。用斜率法和容量法求得树脂支载的氨基酸基因与铜离子之间的配位比为2:1。 相似文献
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用简便方法制备得载溴树脂并用于酚类的溴化,当采用不同摩尔比的载溴树脂时,有选择地得到一溴、二溴及三溴代物,并有较高的产率,同时该树脂具有良好的稳定性。 相似文献
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1INTRODUCTIONThesynthesisofopticallypurechiralcompoundshasgainedgreatimportance,particularlyintheareasofphannaceuticals,agrochemical,flavorsandfragrances[l].SeveraldifferentstrategiesareappliedtomanufactUreopticallypurechiralsubstrates.Amongthem,asymmetriccatalysisprovidespowerfulanduniqueadvantages,perhapstheforemostisthe"multiplicationofchirality",alargequantityofchiralproductcanbeproducedusingacatalyticamountofachiralsourceIZI.However,uptonowonlyafewprocesseshavemadethestepfromanacade… 相似文献
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1IN'TRODUCTIONTheasymmetrichydrosilylationofprochiralketonestochiralsilo-canes.followedbyhydrolysistochiralalcohols,hasbeenawell-stUdiedsystemoverpast25yearsl'l,owingnotonlytotheimportanceofenantiomericallypurealcoholsinoceanicsynthesisbutalsototheexceedinglymildreactionconditionslZIascomparedtothecorrespondinghydrogenation.Bidentatephosphineligandswereusedinitially'lbutuntilrecentlythebestresultSwereobtainedwiththenophosphineligands[.],suchas2'2-pyridy1)-4-carbethoxy-l,3-thiazo1idine[4]… 相似文献
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Four polymer-supported Fe-Co tetrametallic clusters have been prepared by ion exchange and ligand exchange. Their structures were characterized by IR, UV/visible diffuse reflectance spectra and elemental analysis, and by analogy with the reference cluster PhCH_2NMe_3FeCo_3 (CO)_2 . The four heterogenous clusters were efficient catalysts in the hydroformylation of 1-hexene, turnover numbers amounted to 823 —924 with the yield of 83.2—92.4% heptyl aldehydes and ratios of normal aldehyde to iso-aldehyde of 1.2—1.6, they are facilitated forming the normal aldehyde in comparison with the homogeneous analogue. For the polymer-supported clusters prepared by ion exchange, the polymer-cation parts had no obvious effect on the activity of the cluster anion. The polymer-phosphine substituted cluster prepared by ligand exchange was more stable than the clusters preparedby ion exchange. 相似文献
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Polymer-supported ruthenium complexes Ⓟ-Phen-Ru-①, Ⓟ-Phen-Ru-②, Ⓟ-Phen-Ru-③, Ⓟ-Phen-Ru-④, Ⓟ-Phen-Ru-⑤, Ⓟ-Phen-Ru-⑥ and Ⓟ-Phen-Ru-⑦ were prepared using aminomethyl polystyrenes of different morphological structures as supports. A variety of alcohols were oxidized efficiently into the corresponding ketones, carboxylic acids or aldehydes with iodosylbenzene (PhIO) catalyzed by aminomethyl polystyrene-supported ruthenium complexes under mild reaction conditions in acetonitrile. The influences of morphological structure of the polymer supporters on the catalytic properties of these metal complexes were investigated in detail. 相似文献