REACTIONS OF CYCLIC ENAMINES WITH DICYANOMETHYLENECYCLOPROPENES. FORMATION OF MEDIUM RING COMPOUNDS AND TRANSANNULATION TO FULVENES
Several cyclic enamines with five to seven-membered rings react with 2-(1,2-diphenyl-3-cyclopropenylidene)propanedinitrile to give medium ring compounds, showing that the latter is a versatile reagent which can insert three carbon atoms between α- and β-c