Introduction.- Closed shell heavier tetrylidyne complexes of group 6 metals.- Open-shell heavier tetrylidyne complexes of group 6 transition metals.- Germylidyne mediated C-C coupling reaction of isonitriles - formation of an N-heterocyclic germylene.- A new method for the synthesis of manganese tetrylidyne complexes.- An open-shell manganese stannylidyne comprising of a tin-centered unpaired electron.- µ-Ylido complexes.- Chemistry of the metallatetrylidyne complexes.- Plumbylidyne transfer reaction.- Access to the first NHC-stabilized disilavinylidene.- Summary and Outlook.- Experimental Section. ukryj opis