N ‐Heterocyclic Carbenes with a Nido ‐C ₂ B ₉ Carborane Backbone

Main observation and conclusion The steric and electronic properties of N ‐heterocyclic carbenes (NHCs) can be modified by the exocyclic substituents at the nitrogen atoms, by 1—3 atoms’ replacements of the five‐membered imidazolium skeleton and by the changes of the backbones. Herein, we report the usage of nido ‐C 2 B 9 carborane anions as the backbones of NHCs. Stirring the mixture of secondary amino o ‐carboranes (1b—1e), triethyl...