An operationally mild, ruthenium-based photocatalytic protocol has been developed for the conversion of gamma-mono- and gamma-disubstituted allyl carbonates in the presence of Umemoto´s reagent to afford novel types of six-membered cyclic carbonates. Variation and diversification of the carbonate ring substitution provides access to substituted monomers useful in ring-opening polymerization leading to polycarbonates with potentially tailored properties, as illustrated by comparative experiments using monomers with different pi-stacking capabilities.