Zinc(ii)-catalyzed reactions of carbon dioxide and propargylic alcohols to carbonates at room temperature†
Carbon dioxide (CO2) is an abundant and renewable feedstock for the production of value-added chemicals. Herein, we carried out the first work to use ZnI2/NEt3 as the catalyst for the reactions of CO2 and propargylic alcohols to form α-alkylidene cyclic carbonates. It was discovered that the catalyst system could efficiently promote the reaction at room temperature under solvent-free conditions, and the yields of the target products could reach 99%. The zinc(II) and NEt3 play excellent synergistic roles in activating both CO2 and propargylic alcohols.