N-heterocyclic carbenes as efficient organocatalysts for CO2 fixation reactions.
Getting a fix: N-heterocyclic carbenes (NHCs) and NHC-CO(2) adducts serve as potent organocatalysts for carbonate synthesis by the addition of a CO(2) unit to propargylic alcohols or epoxides under mild and solvent-free reaction conditions (see scheme). The enhanced Lewis basicity of imidazol-2-ylidenes bearing electron-donating alkyl groups on the nitrogen atoms leads to utilizing CO(2) as a nucleophilic fragment in the chemical fixation processes.
Kayaki
Yoshihito
Y
Department of Applied Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan.
Yamamoto
Masafumi
M
Ikariya
Takao
T