2,2-Bis(trifluoromethyl)ethylene-1,1-dicarbonitrile as a unique enophile
摘要:
The title compound (BTF) is the only known electrophilic ethylene derivative which undergoes ene reactions with unactivated alkenes at room temperature. The allylic hydrogen is transferred either to the CF3- or the CN-bearing carbon of BTF, depending on the structure of the alkene. In a new mechanistic concept, two transition states allow to classify alkenes and to predict the orientation of their ene reactions.