The chemistry of transition metal carbyne complexes has become a highly attractive field during the past twenty years. In recent years its application to aspects of catalysis and metathesis has gained considerable interest from inorganic as well as organic chemists. In addition, organic synthesis by means of metal carbon multiple bond reagents offers the most sophisticated technology currently available. In consideration of these developments some of Professor E. O. Fischer's former coworkers and colleagues felt obliged to orga­ nize this NATO Advanced Research Workshop on Transition Metal Carbyne Complexes in the Bavarian Alps. They have been encouraged by the fact that most of the distinguished scientists in the field of metal-carbon multiple bond chemistry had finally agreed to participate and to present stimulating lectures. The organizers of the workshop are deeply grateful to the Scientific Affairs Division of the NATO for the generous financial support of the meeting in Wildbad Kreuth and for the preparation of this book. They also feel indebted to acknowledge the generous support from Wacker-Chemie, BASF, Peroxid-Chemie, Hoechst and Bayer. Finally they thank the staff of the Hanns-Seidel-Stiftung in Wildbad Kreuth for providing a pleasant and stimu­ lating atmosphere during the meeting.

Table of Contents:
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.