Use of Pyridine-Coated Star-Shaped ROMP Polymer As the Supporting Ligand for Ruthenium-Catalyzed Chemoselective Hydrogen Transfer Reduction of Ketones

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• 作者：Kotohiro Nomura ; Kotaro Tanaka ; Sakiko Fujita
• 刊名：Organometallics
• 出版年：2012
• 出版时间：July 23, 2012
• 年：2012
• 卷：31
• 期：14
• 页码：5074-5080
• 全文大小：444K
• 年卷期：v.31,no.14(July 23, 2012)
• ISSN：1520-6041

文摘

鈥淪oluble鈥?star-shaped polymers containing a pyridine ligand at the chain ends, prepared by adopting sequential living ring-opening metathesis polymerizations (ROMP) of norbornene and a cross-linking reagent using Mo(CHCMe₂Ph)(N-2,6-ⁱPr₂C₆H₃)(O^tBu)₂ via a 鈥渃ore-first鈥?approach, have been employed as ligands for Ru-catalyzed chemoselective hydrogen transfer reductions of various ketones (cyclohexanone, 5-hexen-2-one, 2-allylhexanone, 5-isopropenyl-2-methylcyclohexanone). The activity increased upon addition of the above polymer as the ligand: the prepared catalyst could be recovered quantitatively and reused without decreasing in both activity and selectivity.