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N‐Heterocyclic Carbenes as Efficient Organocatalysts for CO2 Fixation Reactions |
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| Authors: | Yoshihito Kayaki Dr. Masafumi Yamamoto Takao Ikariya Prof. Dr. |
| Affiliation: | 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), Fax: (+81)?3‐5734‐2637 |
| Abstract: | Getting a fix : N‐heterocyclic carbenes (NHCs) and NHC–CO2 adducts serve as potent organocatalysts for carbonate synthesis by the addition of a CO2 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 CO2 as a nucleophilic fragment in the chemical fixation processes.  |
| Keywords: | carbene carbon dioxide fixation carboxylation nucleophilic addition organocatalysis |