Abstract
This chapter focuses on structurally characterized main group element containing species that include at least one N-heterocyclic carbenes (NHCs) ligand. These structures include adducts of simple Lewis acids as well as stabilized highly reactive main group molecules. Examples of catalysis are presented wherein the combination of both NHC and main group fragments are key to the observed behavior. The deprotonation of imidazolium ions as well as reductive processes has resulted in a convenient syntheses for a wide variety of substituted NHCs. Reported lithium salts of NHCs remain relatively few despite the fact that they offer potential to be effective and affordable transmetallation reagents. Compared to the heavier group 2 elements, the chemistry of beryllium with NHCs has been relatively unexplored. The Lewis acidic nature of many group 13 compounds makes them ideal candidates for complexation with nucleophilic NHCs.
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