Formation of Cyclic Allenes and Cumulenes by Cooperative Addition of Frustrated Lewis Pairs to Conjugated Enynes and Diynes
作者:Cornelia M. Mömming、Gerald Kehr、Birgit Wibbeling、Roland Fröhlich、Birgitta Schirmer、Stefan Grimme、Gerhard Erker
DOI:10.1002/anie.200906697
日期:2010.3.22
Eight, not six: The intramolecular frustrated Lewis pair 1 reacts with conjugated enynes and diynes by 1,4‐addition to yield the corresponding eight‐membered cyclic allenes 2 and cumulenes 3, respectively. The thermodynamically more favorable 1,2‐addition (formation of six‐membered‐ring products) is not observed, which indicates that the observed addition is a kinetically controlled reaction.
八个而不是六个:分子内受阻的路易斯对1通过加成1,4与共轭烯炔和二炔反应,分别产生相应的八元环烯2和枯草酮3。没有观察到热力学上更有利的1,2加成(六元环产物的形成),这表明观察到的加成是动力学控制的反应。