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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Catalysis with platinum carbonyl clusters
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Catalysis with platinum carbonyl clusters

机译：羰基铂簇催化

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In order to explain our interest in the selective reduction by proton and electron addition, and asymmetric hydrogenation, the historical background and the current status of carbonyl clusters as catalysts are briefly described, The unique redox chemistry of the anionic platinum carbonyl clusters (Chini clusters) has been utilized to design a model for the DH-driven transport of electrons through biological membranes. The platinum clusters have also been used as catalysts for the reduction of biological co-factors and proteins by dihydrogen. To overcome the water insolubility problem of the platinum clusters, tao approaches have been adopted, In the first, a biphasic system consisting of water and a solution of the platinum cluster in a water immiscible organic solvent is used, In such a reaction system, by using a redox active dye such as Safranine O as the shuttle carrier for two electrons and one proton, the reduction of flavin and nicotinamide cofactors by dihydrogen could be effected, The regeneration of NADH from NAD(+) by dihydrogen can be further coupled with lactate dehydrogenase catalysed reduction of pyruvate to lactate. In the second approach, the platinum clusters are anchored onto a biocompatible anion exchange resin such as QAE-SEPHADEX. The sephadex-supported material catalyses the reduction of flavin cofactors and CytC(ox) by dihydrogen in Mister. The platinum clusters could also be anchored onto cross-linked polystyrene, functionalized with chiral quaternary ammonium groups, This material becomes an active heterogeneous hydrogenation catalyst after thermal decarbonylation, and reduces methyl pyruvate to methyl lactate with high enantioselectivity. [References: 43]
机译：为了解释我们对通过质子和电子加成以及不对称氢化进行选择性还原的兴趣，简要描述了羰基簇作为催化剂的历史背景和当前状态。阴离子羰基羰基簇（Chini簇）的独特氧化还原化学已利用DH设计模型来驱动DH驱动电子通过生物膜。铂簇也已被用作催化剂，以通过二氢还原生物辅因子和蛋白质。为了克服铂族簇的水不溶性问题，已采用道方法。首先，使用由水和铂族簇在与水不混溶的有机溶剂中的溶液组成的双相体系，在这样的反应体系中，使用氧化还原活性染料如番红O作为两个电子和一个质子的穿梭载体，可以实现双氢对黄素和烟酰胺辅因子的还原，二氢从NAD（+）再生NADH可以与乳酸进一步偶联脱氢酶催化丙酮酸还原为乳酸。在第二种方法中，铂簇固定在生物相容性阴离子交换树脂上，例如QAE-SEPHADEX。 Sephadex负载的材料催化Mister中二氢对黄素辅因子和CytC（ox）的还原。铂簇也可以锚定在交联的聚苯乙烯上，并用手性季铵基团官能化。该材料在热脱羰后成为活性多相加氢催化剂，并以高对映选择性将丙酮酸甲酯还原为乳酸甲酯。 [参考：43]

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