To demonstrate the utilization of an alternative initiator, hydrazonium 12 gave rise to the terminal fluorine-tagged polymer 9 (entry 4, Mn = 3.6 kDa, Đ =1.4). In addition, the utilization of a different cyclopropene monomer 8 led to the production of the corresponding polymer 10 (entry 5, Mn = 9.4 kDa, Đ =1.2).