Frustrated Lewis Pair Behavior of an Open, Noninteracting Phosphane/Borane Pair at a Rigid Organic Framework: Exploring Decisive Factors for FLP Activity
作者:Ke-Yin Ye、Constantin G. Daniliuc、Shunxi Dong、Gerald Kehr、Gerhard Erker
DOI:10.1021/acs.organomet.7b00819
日期:2017.12.26
vicinal P/B frustrated Lewis pair (FLP) at the very rigid, dibenzobicyclo[2.2.2]octadiene (“semi-triptycene”) framework shows a trans 1,2-arrangement of the Mes2P– and (C6F5)2B– Lewis base/Lewis acid pair. It is an active dihydrogen splitting reagent and shows a great variety of typical frustrated Lewis pair reactions under mild reaction conditions. This includes the 1,1-addition reaction to nitric oxide
在非常刚性的二苯并双环[2.2.2]辛二烯(“半三萜”)骨架上的开放的,不相互作用的相邻P / B沮丧的Lewis对(FLP)显示了Mes 2 P-和(的反式1,2-排列C 6 F 5)2 B– Lewis碱/路易斯酸对。它是一种活性二氢裂解剂,在温和的反应条件下显示出多种典型的沮丧的路易斯对反应。这包括与一氧化氮(NO)进行1,1加成反应以形成持久的FLPNO •一氧化氮自由基,以及通过Piers's硼烷[HB(C 6 F 5)2]还原CO]在反应性FLP模板上。新的FLP经历了热力学上对1,2-二酮有利的1,4-加成反应。多数产物通过X射线衍射表征,并通过DFT计算分析1,4-二酮加成反应。与内部相互作用的“亲代”邻位Mes 2 PCH 2 CH 2 B(C 6 F 5)2系统进行比较发现,某些非常活跃的FLP具有决定性的适应症。