Recent Developments of Expanded Ring N-Heterocyclic Carbenes

Author(s): Jie Li, Wang-xing Shen, Xiang-rong Li.

Journal Name: Current Organic Chemistry

Volume 16 , Issue 23 , 2012

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The tremendous advances in N-Heterocyclic carbenes (NHCs) have made them the ligand of choice for many transition-metalcatalyzed transformations. Due to the stability of the transition metal complexes of NHCs as well as their stability to air and moisture, NHCs are regarded as an attractive alternative to their phosphine counterparts. To date, research has largely focused on five-membered ring carbenes. However, several reports have demonstrated that changes to the size of the heterocyclic ring (six-, seven-, and eightmembered derivatives) can affect the properties including increased basicity, greater steric demand, and larger N-CNHC-N angle. In this review, we survey recent developments in the design and synthesis of some expanded ring NHCs with a particularly strong influence on the metal’s coordination.

Keywords: N-Heterocyclic carbenes, Rhodium, Iridium, Expanded ring NHCs, Catalysis, Ligand.

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Article Details

Year: 2012
Page: [2879 - 2891]
Pages: 13
DOI: 10.2174/138527212804546859
Price: $58

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PDF: 13