2,4,6-Cycloheptatriene-1-carbonitrile (7-Cyanocycloheptatriene) is a 7-substituted cycloheptatriene. Its synthesis by reacting tropylium cation with cyanide anion has been described. 2,4,6-cycloheptatriene-1-carbonitrile affords toluene or toluonitrile during flash photolysis studies. Its diamagnetic susceptibility has been determined, which is useful for the derivation of its susceptibility exaltation. It reacts with acetyl acetone in the presence of Mn(OAc)3 to form products derived from the norcaradiene structure.