Formation and reactions of active five-membered phosphane/borane frustrated Lewis pair ring systems
作者:Shunxi Dong、Long Wang、Tongdao Wang、Constantin G. Daniliuc、Melanie Brinkkötter、Hellmut Eckert、Gerald Kehr、Gerhard Erker
DOI:10.1039/c8dt00672e
日期:——
The reactive five-membered frustrated P/B Lewis pair 6a was generated from Tipp-P(vinyl)2 (Tipp: 2,4,6-triisopropylphenyl) by a series of anti-Markovnikov and Markovnikov hydroboration reactions. The in situ generated compound dimerized to give 7a under kinetic control and the dimer pair 8a/9a under thermodynamic control. The Mes*-P(vinyl)2 analogue (Mes*: 2,4,6-tri-tert-butylphenyl) reacts in a similar
反应性五元受阻的P / B Lewis对6a是由Tipp-P(乙烯基)2(Tipp:2,4,6-三异丙基苯基)通过一系列反Markovnikov和Markovnikov硼氢化反应生成的。该原位生成的化合物的二聚,得到图7a动力学控制下和二聚体对8A / 9A热力学控制下。在MES * -P(乙烯基)2类似物(MES *:2,4,6-三-叔丁基苯基)发生反应以类似的方式,但在这种情况下的热力学二聚体在室温观察到,而单体6B是主导种在80°C的溶液中。它是一种活性二氢裂解剂。这原位生成的单体五元P / B FLP经历与各种有机π试剂的加成反应。与苯甲醛或苯乙炔一起,得到相应的两性离子异降冰片烯或-降冰片二烯型产物,后者释放出乙烯。