5-benzoheptatrienyl metalcompounds 1a−m by treatment with KO-t-Bu as base. These metalcompounds undergo the various types of reactions in good yields and exclusively depending on the nature of substituents R1 and R3. Thus, metalcompounds 1a−c carrying alkyl substituents R1 and R3 form 3H-benzodiazepines 6a−c after electrophilic quench of the intermediate cyclic anion 7 in a 7-endo-trig electrocyclic reaction with