Chemistry

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

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

There are just few issues in organometallic chemistry, that have motivated examine 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 examine Workshop on Transition-Metal Carbene Complexes used to be the 1st assembly which,brought jointly scientists from various disciplines to debate inorganic, natural, theoretical structural catalysis-related elements of steel carbene chemistry. The seventieth birthday of Professor E.O. Fischer used to be an excellent get together for this firm. The organizers of the assembly (K.D. Dotz, Marburg; F.R. KreiBl, Munchen; U. Schubert, Wurzburg) have been inspired by means of the truth that many of the prime scientists during this zone have been capable of perform the workshop. The very excessive average of the contributions is mirrored during this booklet, which includes papers from nearly all of the members. The court cases convey 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 aid for the workshop and for the practise of this ebook was once supplied by way of the medical 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 through the conference.

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CH2 PPh3 ON .......... 5 Reaction of Methylene Complexes with CO and CNR. 1 ~B Methylene Complexes. As explained above the non-innocence of the nitrosyl ligand permits coordination of an additional ligand to Os(=CH2)Cl(NO)(PPh3)2 and this probably precedes formation of coordinated ketene and ketenimine when the dB methlene complex is treated with CO and CNR respectively. L HCl ) ON"", I /Cl Os Cl/ ""'~ I L 0 - CH3 L ON"", I Os=CH2 cl/I L V(NO) 1690 cm- 1 V(NO) 1B50, v(CO) 1605 cm- 1 ~ CNR' V(NO) 1700 cm- 1 (L = PPh3' R H or Me, R' = E-tolyl) The coordinated ketene is labile and easily displaced by CO to give OsCl(CO)(NO)(PPh3)2' A further reaction is with HCl to give the acetyl complex, Os(C[0]CH3)C12(NO)(PPh3)2' In contrast the ketenimine complex is protonated or methylated at nitrogen as shown in the scheme above.

Chem. (1988) 25th anniversary issue. METAL-MEDIATED CYCLIZATION OF ALKYNES AND CARBENES: A NEW ROUTE TOWARD HIGHLY SUBSTITUTED CYCLOPENTANOIDS J. M. O'Connor*; L. Pu; 1. A. Johnson and R. Uhrhammer Department a/Chemistry, D-006 University 0/ California, San Diego La Jolla, CA 92093 USA ABSTRACf. The synthesis and reactivity ofmetallacycle-cartJene complexes is presented within the context of a potential route toward cyclopentadiene molecules. We also discuss our recent results on the successful cyclization of twoalkynes and a carbene moiety.

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