Linear polydicyclopentadiene was produced with a third generation Grubbs‐type Ru–alkylidene complex. At high catalyst loadings, the polymer shows a portion of the polymer with a low degree of branching owing to secondary ROCM as seen in the SEC analysis. Distinct signals are observed via low angle scattering analysis for polymers with twice or another multiple of the average molecular weight of the linear polymer hence strongly affecting the controlled‐living nature of the polymerization.
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