Rhodium Complexes Bearing 1,10-Phenanthroline Analogue Bis-NHC Ligands Are Active Catalysts for Transfer Hydrogenation of Ketones

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• 作者：Verena Gierz ; Aurelija Urbanaite ; Alexander Seyboldt ; Doris Kunz
• 刊名：Organometallics
• 出版年：2012
• 出版时间：November 12, 2012
• 年：2012
• 卷：31
• 期：21
• 页码：7532-7538
• 全文大小：336K
• 年卷期：v.31,no.21(November 12, 2012)
• ISSN：1520-6041

文摘

Synthesis of a new example of the pyridazine annelated bis(N-heterocyclic carbene) ligand 3b (vegi) bearing benzyl substituents is reported, as well as the synthesis of its cationic Rh(cod) complex 5b. The mechanism of formation of the [Rh(cod)(vegi)]⁺ complexes was investigated, showing a stepwise deprotonation of the imidazolium moieties via the mono-carbene imidazolium Rh(cod)Cl species 4. The [Rh(cod)(vegi)]⁺ complexes 5a,b show catalytic activity in the transfer hydrogenation of even sterically hindered ketones.