Trapping Intermediates in an [8 + 2] Cycloaddition Reaction with the Help of DFT Calculations
作者:Marta L. Lage、Israel Fernández、Miguel A. Sierra、M. Rosario Torres
DOI:10.1021/ol200910z
日期:2011.6.3
DFT calculations predict that the [8 + 2] cycloadditionreaction between ketenes and 8-azaheptafulvenes occurs stepwise through antiaromatic zwitterionic intermediates. With adequate modifications of both the electronic properties of the ketene and the reaction conditions, these elusive intermediates have been successfully trapped and fully characterized (X-ray), thus confirming the predicted stepwise