Transition Metal-Catalyzed [4 + 2 + 2] Cycloadditions of Bicyclo[2.2.1]hepta-2,5-dienes (Norbornadienes) and Bicyclo[2.2.2]octa-2,5-dienes<sup>1</sup>
作者:Yan Chen、Rattana Kiattansakul、Bin Ma、John K. Snyder
DOI:10.1021/jo010268o
日期:2001.10.1
The transition-metal-catalyzed [4 + 2 + 2] cycloadditions of norbornadienes, bicyclo[2.2.2]octa-2,5-diene, and benzobarrelene with 1,3-butadienes proceed in excellent yields using cobalt-based catalytic systems. Two key distinctions between these [4 + 2 + 2] cycloadditions and the corresponding transition-metal-catalyzed [2 + 2 +2] reactions of norbornadiene are the requirement of a bimetal catalytic
Racemic NHC–Iridium Complexes with Electron-Poor Diene Ligands and Their Reactivity in the Intramolecular Hydroamination Reaction
作者:Pengchao Gao、Daven Foster、Gellért Sipos、Brian W. Skelton、Alexandre N. Sobolev、Stephen A. Moggach、Reto Dorta
DOI:10.1021/acs.organomet.9b00414
日期:2019.10.14
analyzed using the SambVca program. The corresponding cationic and catalytically active [(NHC)Ir(diene)][PF6] complexes were generated via chloride abstraction with AgPF6. Where possible, these species were isolated and fully characterized. The less stable members were freshly made before being tested as catalysts in a prototypical intramolecular hydroamination reaction of an unactivated aminoalkene. A comparison