<i>Endo-</i> and <i>Exo-</i>Configured Cyclopropylidenes Incorporated into the Norbornadiene Skeleton: Generation, Rearrangement to Allenes, and the Effect of Remote Substituents on Carbene Stability
作者:Benan Kılbaş、Akιn Azizoǧlu、Metin Balci
DOI:10.1021/jo901398w
日期:2009.9.18
For the synthesis of endo-configured cyclopropylidenes annelated to benzonorbornadiene, first the exo-bridge hydrogen in benzonorbornadiene was blocked with ethyl, bromine, and methoxy groups. All efforts to add dichloro-, dibromo-, or fluorobromocarbenes to ethylbenzonorbornadiene failed. However, addition of fluorobromocarbene to bromo- or methoxybenzonorbornadiene gave the corresponding cyclopropane