Substitution on the aryl ring of the carbene precursor had a minimal impact on the ratio of the azetidine:dehydropiperidine, as highlighted in reactions to furnish 3cf-3cj. Reaction of the monomethyl-substituted aziridine 1a with 2h gave azetidine 3ah in 69% yield and a high selectivity of >19:1, indicating that sterics of the methyleneaziridine is not solely responsible for the preference for the 4-membered ring. We were also pleased to find that disubstitution could be tolerated at the β alkene carbon of the carbene precursor 2n to give the fully substituted azetidine 3cn with a 4:1 preference over formation of the dehydropiperidine.