Synthesis of New Iridium N-Heterocyclic Carbene Complexes Bearing a Functionalized Cp* Ligand and Their High Catalytic Activities in the Oppenauer-Type Oxidation of Alcohol
作者:Fumihiro Hanasaka、Ken-ichi Fujita、Ryohei Yamaguchi
DOI:10.1021/om060475k
日期:2006.9.1
The new iridium N-heterocyclic carbene complexes Cp*NIr(IMeMe)Cl2 and Cp*NIr(IMe)Cl2 (Cp*N = η5-1-[2-(dimethylamino)ethyl]-2,3,4,5-tetramethylcyclopentadienyl; IMeMe = 1,3,4,5-tetramethylimidazol-2-ylidene; IMe = 1,3-dimethylimidazol-2-ylidene) have been synthesized by reaction of η5:η1-Cp*NIrCl2 with silver(I) carbene complexes or a free carbene. The catalytic systems using new iridium carbene complexes
新的铱N-杂环卡宾络合物的Cp * Ñ的Ir(IMeMe)氯2 1和Cp * Ñ的Ir(IME)氯2(CP * Ñ =η 5 -1- [2-(二甲基氨基)乙基] -2,3,4,5- 4,5-四甲基环戊二烯; IMeMe = 1,3,4,5- tetramethylimidazol -2-亚基; IME = 1,3-二甲基咪唑烷-2-亚基)已经由η的反应合成5:η 1 -Cp * ñ的IrCl 2个与银(I)卡宾配合物或游离卡宾一起使用。使用新型铱卡宾络合物作为催化剂前体和AgOTf的催化体系在酒精的Oppenauer型氧化中显示出高催化活性,适用于通过使用[Cp * Ir(IMeMe)难以氧化的酸敏感性醇的氧化(MeCN)2 ] [OTf] 2。