A supported rhodium hydroxide catalyst: Preparation, characterization, and scope of the synthesis of primary amides from aldoximes or aldehydes
A supported rhodium hydroxide catalyst: Preparation, characterization, and scope of the synthesis of primary amides from aldoximes or aldehydes
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DOI：
10.1002/asia.200800067
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发表时间：
2008-01-01
影响因子：
4.1
通讯作者：
Mizuno, Noritaka
中科院分区：
文献类型：
--
作者：
Fujiwara, Hiroshi;Ogasawara, Yoshiyuki;Mizuno, Noritaka
负载型氢氧化铑催化剂Rh（OH）（x）/Al_2 O_3（X = 3）是通过Al_2 O_3与RhCl_3在水介质中反应，然后用NaOH处理而制备的。Rh-III氢氧化物物质单体地（或高度地）分散在Al 2 O3载体上。Rh（OH）（x）/Al_2O_3在水中作为可重复使用的多相催化剂，而不是在爆炸性的、危险的和致癌的有机溶剂中，通过有效的连续脱水和再水化过程从醛肟或醛合成伯酰胺。Rh（OH）（x）/Al_2 O_3催化剂对醛和羟胺的脱水缩合反应也有促进作用。
A supported rhodium hydroxide catalyst, Rh(OH)(x)/Al2O3 (X = 3), is prepared by the reaction of Al2O3 with RhCl3 in an aqueous medium followed by treatment with NaOH. The Rh-III hydroxide species is monomerically (or highly) dispersed on the Al2O3 support. Rh(OH)(x)/Al2O3 acts as a reusable heterogeneous catalyst in water, rather than in an explosive, hazardous, and carcinogenic organic solvent, for the synthesis of primary amides from aldoximes or aldehydes by an efficient sequential process of dehydration and rehydration. The dehydrative condensation of aldehydes and hydroxylamine is also promoted by the Rh(OH)(x)/Al2O3 catalyst.