Advances in Organometallic Chemistry, Volume 81 in this ongoing series, highlights new advances in the field, with this new volume presenting interesting chapters written by an international board of authors. Specific chapters cover Recent Advances in the Catalytic Applications of NHC-Early Abundant Metals (Fe, Mn, Co) Complexes, A Guide to Non-Carbonyl, Non-Isocyano Organometallic Chemistry of Technetium-99 from Discovery to 2023, and Cyclopentadienyl, Amidinate (CPAM) Complexes of Groups 4 - 6 Transition Metals.