Next, we turned to exploring the monomer scope of our methodology (Figure ). We decided to survey our methodology at an initial loading of 1 eq. LiOBn: 500 eq. epoxide: 200 eq. PTA : 200 eg. S at 100 ºC which for PO (Table run #0) delivers a linkage selectivity of 87% hence allowing us to study how monomer choice affects selectivity shedding further mechanistic light on our methodology.