Addition of 2 to 3a also leads to C-C bond activation and formation of the ring-opened product 7a. In Even at elevated temperature C-C bond activation of 4-,5-and 6-membered hydrocarbons was not observed with Zn. From these experiments, we can suggest that the scope of reactivity is broader for Mg compared to Zn and, given that the monomeric units of 1 and 2 are isostructural, that C-C bond activation is more facile with the more electropositive metal magnesium.