The present disclosure provides cis-polycycloolefins and methods for forming cis-polycycloolefins typically having 50% or greater cis carbon-carbon double bonds comprising contacting a first cyclic hydrocarbyl monomer with a catalyst represented by Formula (I): wherein: M is a group 8 metal; Q1, Q2, and Q3 are independently oxygen or sulfur; each of R1 and R4 is a halogen; R9 is C1-C40 hydrocarbyl or C1-C40 substituted hydrocarbyl; and each of R2, R3, R5, R6, R7, R8, R10, R11, R12, R13, R14, R15, R16, R17, R18, and R19 is independently hydrogen, halogen, C1-C40 hydrocarbyl or C1-C40 substituted hydrocarbyl. In at least one embodiment, a polycyclopentene has 50% or greater cis carbon-carbon double bonds.