Advances in Metal Carbene Chemistry by E. O. Fischer (auth.), U. Schubert (eds.)

By E. O. Fischer (auth.), U. Schubert (eds.)

There are just few issues in organometallic chemistry, that have inspired study actions in as many parts, as transition-metal carbene (alkylidene) complexes. approximately 25 years after the 1st deliberate synthesis of a carbene advanced in E.O. Fischer's laboratory in Munich the NATO complex learn Workshop on Transition-Metal Carbene Complexes was once the 1st assembly which,brought jointly scientists from various disciplines to debate inorganic, natural, theoretical structural catalysis-related points of steel carbene chemistry. The seventieth birthday of Professor E.O. Fischer was once a great get together for this company. The organizers of the assembly (K.D. Dotz, Marburg; F.R. KreiBl, Munchen; U. Schubert, Wurzburg) have been inspired via the truth that lots of the top scientists during this region have been capable of perform the workshop. The very excessive ordinary of the contributions is mirrored during this ebook, which includes papers from nearly all of the individuals. The court cases express the state-of-the-art in steel carbene chemistry and should optimistically be a landmark within the improvement of this region of chemistry. beneficiant monetary help for the workshop and for the guidance of this booklet used to be supplied by means of the clinical Affairs department of NATO and a few businesses. The organizers additionally recognize the efforts of the workers of the Bildungs­ zentrum der Hans-Seidel-Stiftung in Wild undesirable Kreuth for making a friendly and stimulating surroundings in the course of the conference.

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CARBYNE TO CARBENB CONVERSION REACTIONS DIMET AL CENTRES AT HETERONUCLEAR F. GORDON A. STONE Department of Inorganic Chemistry The University Bristol SS8 1TS England ABSTRACT. Compounds with allcylidyne ligands bridging heteronuclear metal-metal alkyl or aryl) bonds provide an opportunity to study the chemistry of ,,-CR (R groups in a variety of different electronic and steric environments. Reactivity patterns are strongly influenced both by the nature of the group R, and by the metal-ligand fragments with which the ,,-CR ligands are associated.

A quite different reaction occurs when the d 6 ~ethylene complex Os(=CH2)(n2-C[0]~-tolyl)Cl(PPh3)2 is treated with CO. Two products are formed, one is colourless and cationic, the other bright yellow and neutral. Both compounds contain a metallaoxetene ring, Os=CROCH2, formed by the oxygen of the acyl ligand adding to the methylene carbon. /I ~C·/ ' PPh3 R , 10% yellow v(CO) 1921 cm- 1 With Ru(=CH2)(n2-C[0]R)Cl(PPh3)2 and CO only the cationic metallaoxetene is formed and with isocyanide a similar reaction ensues.

Reactivity patterns are strongly influenced both by the nature of the group R, and by the metal-ligand fragments with which the ,,-CR ligands are associated. Discussion will focus on reactions in which the alkylidyne fragment is converted into an alkylidene group. Often the alkylidyne to alkylidene step is followed by further transformations leading to products of many different structural types. V. Ashworth working in my laboratory discovered the reaction shown in Scheme 1. 1 The methodology of the synthesis of the tungsten-platinum compound (1) was based on the isolobal mapping between the fragments W(COh(71-CsHs) and CC6H4Me-4.

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