Olefin Metathesis by Well-Characterized Re(VII ) Alkylidene/alkylidyne Complexes.- Protonation Reactions of Alkylidyne(Carbaborane) Complexes of the Group 6 Metals.- Cyclometalated Aryloxy(Chloro)Neopentylidene-Tungsten Complexes. Syntheses from Neopentylidyne Complexes and Catalytic Properties in Olefin Metathesis.- Reaction of Some Alkylidyne Complexes of Tungsten with Inorganic Oxides: a General Route towards Active Supported W Based Metathesis Catalysts?.- On the Route from Stoichiometric to Catalytic Reactions of Carbyne Complexes. Part XX (1).- Ylide Nickel Catalysis: Progress in Acetylene Polymerization.- Conjugated Complexes and Polymers Derived from Metal-Alkylidyne Building Blocks.- Methylidyne Complexes: Structures, Spectra, and Bonding.- Novel Cyclizations Involving Cationic Carbyne Complexes.- New addition and Cycloaddition reactions of the Cationic Carbyne Complexes [Cp(CO)(l)m?CR]+ (M = Mn, Re; L = CO, PPh3; R = Me, Tolyl).- Alkynylcarbene Complexes of Transition Metals as Suitable Substrates for Stereoselective Cycloadditions.- Reaction of Alkynols with Alkynylalkoxycarbene Metal (Cr,W) Complexes.- Chemistry and Electrochemistry of Alkyne-and Iso-Cyanide-Derived Carbyne Complexes of Rhenium, Molybdenum or Tungsten.- Photooxidation of Molybdenum and Tungsten Carbynes.- The Determination of the Chemical Bonds in Some Metal-Carbyne Complexes by Structural Studies.- Planar Tetracoordionate Carbon-Experimental Determination of the Charge Density of Cp2Zr(?-?1,?2-Me3SiCCPh)(?-Cl)AlMe2 (I) and Cp2Zr(?-?1,?2-MeCCPh)(?-CCPh)AlMe2 (II).- Carbyne to Carbene Ligand Conversion in Dinuclear Complexes.- Syntheses and Reactions of Heterodinuclear Alkoxycarbyne Complexes.- Multicenter Ligand Transformations of Tetramethyl-Thiourea on Ruthenium Clusters.-Carbyne Complexes of Ruthenium and Osmium.- Towards the Synthesis of Carbyne Complexes of Gold and Copper: New Carbene Complexes.- Double and Triple Bonds to f-Elements: Structure and Chemistry of Actinide Complexes of Multielectron Pair Donor Ligands.- Metal Carbenes and Metal Carbynes as Precursors for a Rational Synthesis of Carbido and Hydrocarbon Bridged Complexes.- Some Chemistry of Tp'(CO)2w?C-H, a Simple Terminal Carbyne.- The Role of Nucleophiles and Electrophiles in Coupling Reactions of Alkylidyne Ligands.- Dicarbonyl(?5-Cyclopentadienyl)Carbyne Complexes of Molybdenum and Tungsten as Building Blocks.- Diversions En Route to Alkylidyne Complexes of Iron.- Electron-Rich Tungsten Aminocarbyne Complexes with Cp* Ligands Synthesis and Protonation Reactions.