共查询到16条相似文献,搜索用时 78 毫秒
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考察了纤维素氧磷-钯配合物对有机锡试剂与有机卤化物交叉偶联反应的催化作用。 结果表明,该负载催化剂对偶联反应具有较高的催化活性和化学选择性,分离容易,可重复使用,XPS分析说明催化剂中起催化作用的是金属态钯。 相似文献
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钯催化交叉偶联反应是一类用于碳碳键形成的重要反应 ,在有机合成中应用十分广泛。着重综述了几种常用的钯催化交叉偶联反应催化剂研究的一些新进展 相似文献
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钯催化芳基硼酸与芳卤偶联反应的工业应用新进展 总被引:1,自引:0,他引:1
钯催化芳基硼酸与芳卤偶联反应(即Suzuki反应)是用于碳碳键形成的重要方法之一,在有机合成中应用十分广泛。本文着重综述了钯催化Suzuki偶联反应在工业化应用方面的一些新进展。 相似文献
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采用硝酸对活性炭进行氧化,增加活性炭上羧基的含量,再与乙二胺反应,在活性炭上引入氨基,然后与氯代二苯基膦反应,将膦配体引入活性炭上,并以此为载体制得活性炭固载的膦钯化合物。采用傅里叶变换红外(FTIR)光谱、X射线光电子能谱(XPS)和透射电镜(TEM)手段对其进行表征,并研究了该催化剂对Heck反应的催化性能。实验结果表明,催化剂中钯通过配位键固定在载体上,在载体表面均匀分布,该催化剂对碘代芳烃和烯烃的Heck反应具有较高的催化活性,并具有良好的循环使用性能。 相似文献
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Dr S.M. Islam Paramita Mondal Kazi Tuhina Anupam Singha Roy 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2010,85(7):999-1010
BACKGROUND: Precise architectures of steric and electronic properties of palladium species play a crucial role in designing highly functionalized catalyst systems responsible for target organic transformations. Pd catalysts supported on polymer materials have been employed extensively as catalysts not only for hydrogenation but also for coupling reactions in the production of fine chemicals. RESULTS: A new polymer‐anchored Pd(II) complex has been synthesized and characterized. The catalyst shows high catalytic activity in the hydrogenation of styrene oxide, Heck cross‐coupling and cyanation reactions of aryl halides. The effect of various reaction parameters were investigated to optimize reaction conditions. The catalytic system shows good activity in the hydrogenation of styrene oxide (conversion 98%) with a selectivity to 2‐phenylethanol (93%) which is higher than its homogeneous analogues. The catalyst also exhibits excellent catalytic activity for the Heck cross‐coupling and cyanation reactions of various substituted and non‐substituted aryl halides. CONCLUSIONS: Results demonstrate that the catalyst is robust and stable and can be recovered quantitatively by simple filtration and reused several times without loss of activity. Copyright © 2010 Society of Chemical Industry 相似文献
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Zhenhua LI Weihan WANG Dongxue YIN Jing LV Xinbin MA 《Frontiers of Chemical Science and Engineering》2012,6(4):410
The syntheses of dimethyl oxalate (DMO) and diethyl oxalate (DEO) by CO coupling reaction in gaseous phase were investigated in a fixed bed reactor over Pd-Fe/Al2O3 catalyst. The catalytic performance was characterized by CO conversion, space-time yield (STY) and selectivity of DMO (or DEO). The results showed that over Pd-Fe/Al2O3 catalyst, the STY of DMO was higher than that of DEO under the same reaction conditions. The optimum reaction temperatures for synthesizing DMO and DEO were 403 K and 393 K, respectively, at the molar ratio 1 ∶ 1 of alkyl nitrite to CO. The difference in synthesizing DMO and DEO on the same catalyst was attributed to the decomposition performances of methyl nitrite (MN) and ethyl nitrite (EN), as density functional theory (DFT) calculation showed that EN decomposed more easily than MN. 相似文献