A Supported Rhodium Hydroxide Catalyst: Preparation, Characterization, and Scope of the Synthesis of Primary Amides from Aldoximes or Aldehydes

Hiroshi Fujiwara, Yoshiyuki Ogasawara, Miyuki Kotani, Kazuya Yamaguchi, Noritaka Mizuno

doi:10.1002/asia.200800067

A Supported Rhodium Hydroxide Catalyst: Preparation, Characterization, and Scope of the Synthesis of Primary Amides from Aldoximes or Aldehydes

DOI Web Site Web Site 被引用文献6件

書誌事項

公開日: 2008-09

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http://onlinelibrary.wiley.com/termsAndConditions#vor

DOI

10.1002/asia.200800067

公開者: Wiley

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<jats:title>Abstract</jats:title><jats:p>A supported rhodium hydroxide catalyst, Rh(OH)<jats:sub>x</jats:sub>/Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> (x=3), is prepared by the reaction of Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> with RhCl<jats:sub>3</jats:sub> in an aqueous medium followed by treatment with NaOH. The Rh<jats:sup>III</jats:sup> hydroxide species is monomerically (or highly) dispersed on the Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> support. Rh(OH)<jats:sub>x</jats:sub>/Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> 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)<jats:sub>x</jats:sub>/Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> catalyst.</jats:p>