“…[26,30,31] Although terminal epoxides are easily converted into 5-membered cyclic carbonates, the conversion of internal di-, triand tetra-substituted epoxides or (substituted) oxetanes into their corresponding five-and six-membered cycles still remained very challenging. [31] To broaden the scope and functionality of cyclic carbonates, other substrates such as propargylic alcohols [15,[32][33][34][35][36][37], 1,2 and 1,3-diols [38][39][40][41] were subjected to carbonation in order to afford α-alkylidene cyclic carbonates, five-and six-membered cyclic carbonates, respectively. Although the use of diols is a promising alternative, their reaction with CO2 is kinetically and thermodynamically limited due to the formation of water as a by-product.…”