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以SnCl4和2,4,6-(CF3)3C6H2Li、2,6-(CF3)2C6H3Li为原料合成了两种含大吸电子取代基的化合物Sn[2,4,6-(CF3)3C6H2]2Cl2(缩写为SnAr2Cl2)和Sn[2,6-(CF3)2C6H3]2Cl2(缩写为Sn Ar′2Cl2),利用X射线衍射仪和核磁共振谱仪(19F NMR)表征了产物SnAr2Cl2和SnAr′2Cl2的晶体结构. 相似文献
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合成了两种新型的固体配合物,其组成为K(BrB15C5)X(X=NCS ̄-或Pic ̄-).钾(Ⅰ)离子不仅能与4’-溴苯并-15-冠-5形成常见的1:2夹心式配合物,而且还能生成稳定的1:1型(M:L)固体配合物. 相似文献
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以2-氰基-6-羟基苯并噻唑为原料,与溴乙醛缩二乙醇缩合制得缩醛后再水解合成中间体6-(2-羰乙基)苯并[d]噻唑-2-甲腈(2);7-苯乙酰氨基-3-氯甲基头孢菌烷酸二苯甲酯依次经碘代和Wittig反应得(Z)-3-[3-(2-氰基苯并[d]噻唑-6-氧)丙-1-烯]-8-羰基-7-(2-苯乙酰氨基)-5-噻-1-氮[4.2.0]辛-2-烯-2-甲酸二苯甲酯(5);5经脱保护、缩合和氧化反应合成了3个新的Bluco类似物,其结构经1H NMR,13C NMR和HR-MS(ESI)表征。 相似文献
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The successful translation from conception to practice of processes based on immobilized biocatalyst technology has been slower
than anticipated. There are severe barriers, both technical and economic, limiting the introduction of immobilized biocatalyst
technology to replace conventional processing procedures and processes for the production of chemicals by synthetic or fermentative
routes. A small number of immobilized enzyme processes are in operation commercially, the most noteworthy being in food-related
processes and in the pharmaceutical industry, where they are used for carbohydrate conversions and antibiotic transformations,
respectively. There does not, as yet, appear to be any large-scale industrial application of immobilized cell technology.
Examples from our laboratory—immobilized yeast for ethanol production andAspergillus niger for citric acid synthesis—illustrate the problems that have to be overcome. 相似文献