| 초록 |
A catalytic system composed of ethylene urea and an alkali metal carbonate or bicarbonate was found to effectively catalyze the carboxylation of diamines by CO2. Experimental and computational calculation studies strongly suggest that ethylene urea plays a role as a proton donor to KHCO3 through a tautomerization from keto to enol form. With such transformation of ethylene urea into enol form and the consequent favorable hydrogen bonding interaction with KHCO3, the proton accepting and donating abilities of KHCO3 can be greatly enhanced and, as a result, the carboxylation is accelerated. |
