sp3-Hybridized Neutral h1-Carbon Ligands.- Neutral ?1-Carbon Ligands: Beyond Carbon Monoxide.- Ylide Ligands.- Carbodiphosphoranes and Related Ligands.- sp2-Hybridized Neutral h1-Carbon Ligands.- Chemistry of N-Heterocyclic Carbene Ligands.- Non-NHCs Stable Singlet Carbene Ligands.- sp-Hybridized Neutral h1-Carbon Ligands.- All-Carbon-Substituted Allenylidene and Related Cumulenylidene Ligands.- Heteroatom-Conjugated Allenylidene and Related Cumulenylidene Ligands.