Abstractcis‐1,2‐Divinylcyclohexane containing 5–10% of thetransisomer was polymerized with FRIEDEL‐CRAFTS (AlCl3, TiCl4) and other cationic catalysts. AlEtCl2‐alkyl halide systems were most effective as catalyst. ZIEGLER‐type catalysts (AlEt3/TiCl4, AlEt2Cl/TiCl4) were also effective, although the cationic species were probably responsible for polymerization. All the polymers obtained were composed almost completely of the cyclized unit and were soluble in common organic solvents. The molecular weight ranged from 1200 to 2300, and the softening point for the polymer of higher molecular weight was 135–145°C. The absence of the pendent vinyl group in polymer suggested that the adjacent vinyl groups conceivably reacted not in a stepwise manner during the cationic propagation. Transfer to solvent was observed in toluene, which probably occurred by way of electrophilic displacement. The cationic reactivity of this monomer (M2) was rather small, as shown by the following reactivity ratios with styrene (M1): r1= 30, r2= 0.01 (AlEtCl2/tert‐BuC