Jun-ichi Kadokawa, Habu Hideyuki, Shinji Fukamachi, Masa Karasu, Hideyuki Tagaya and Koji Chiba
This paper describes the preparation of carbonates by the direct condensation of CO2 with alcohols using a trisubstituted phosphine–carbon tetrabromide–base system as a condensing agent. The yield of dibenzyl carbonate from CO2 and benzyl alcohol was at most 90.7%. The reaction of CO2 with the other primary alcohols such as methanol, ethanol, butan-1-ol, hexan-1-ol, allyl alcohol, and ethylene glycol also gave corresponding carbonates in relatively high yields, whereas yields of carbonates from CO2 and secondary alcohols were low.