CrCl2(THF)2, the dimetallic, divalent cis-[(μ-N)(t-Bu)]2[PNCH2CH2N(i-Pr)2)]2Cr}2 (1b) was obtained in crystalline form. Upon activation with MAO, both 1a and 1b afforded highlyactive, polyethylene-free ethylene oligomerization catalysts. Complex 2a is instead catalytically inactive.