The high cis-selectivity of Ru-4 could be further utilized to construct a cross-linked ADMET polymer that is G2-degradable (Scheme 5). A model study performed with triene 10 and 4 mol% of crosslinker 13 revealed that the terminal double bonds in 10 and 13 had similar reactivity at 80-85% conversion. Accordingly, treatment of 10 with an increased amount of 13 (15 mol%) and Ru-4 (1 mol%) was further carried out, leading to a cross-linked P10 with alternatively placed cis-and trans-double bonds and a gel content of 22%. Nevertheless, treatment of the gel-like material with 3 mol% of G2 in DCM led to its facial degradation, generating 11 in 90% yield.