A tetradecker sandwich compiex (7a) was synthesized in low yield by the reaction of a tripledecker, bis(${eta}^5$-cyclopentadienyl)-${mu}$-(${eta}^6$-1,2,3,4-tetramethyl 1,4-dibora-2,5-cyclohexadiene) dinickel (5a) with potassium and Fe$Cl_2$${cdot}$2THF. The reaction of another tripledecker, bis(${eta}^5$-cyclopentadienyl)-${mu}$-(${eta}^6$-2,3-diethyl-1,4-dimethyl-1,4-dibora-2,5-cyclohex adiene) dicobalt (4a) with potassium and Fe$Cl_2$${cdot}$2THF at room temperature produced a doubledecker complex (2b) via the decomposition of the dark green crystal.