Download Organometallics in Organic Synthesis 2: Aspects of a Modern by G. Wilke (auth.), Prof. Dr. Helmut Werner, Prof. Dr. Gerhard PDF

By G. Wilke (auth.), Prof. Dr. Helmut Werner, Prof. Dr. Gerhard Erker (eds.)

Organic Synthesis through Organometallics is an interdisciplinary undertaking subsidized via the Volkswagen Stiftung to stimulate learn and dialogue of advances within the box. to enhance foreign conversation , major specialists are invited to ordinary symposia. during this quantity, 17 lectures offered on the moment symposium in Würzburg, October 1988, are accumulated. From the themes coated it enhances the former quantity, edited by means of A. de Meijere and H. tom Dieck.

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By G. Wilke (auth.), Prof. Dr. Helmut Werner, Prof. Dr. Gerhard Erker (eds.)

Organic Synthesis through Organometallics is an interdisciplinary undertaking subsidized via the Volkswagen Stiftung to stimulate learn and dialogue of advances within the box. to enhance foreign conversation , major specialists are invited to ordinary symposia. during this quantity, 17 lectures offered on the moment symposium in Würzburg, October 1988, are accumulated. From the themes coated it enhances the former quantity, edited by means of A. de Meijere and H. tom Dieck.

Show description

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Only one out of the possible [2+2] addition products, the exo-transexo 59, is found. Of the four possible homo-Diels-Alder products [26] three have been obtained (exo-cis 60, exo-trans 61 and endo-cis 62, but no endo-trans). Some of these have already been observed in catalyses with "ligand-free" iron catalyst [27], but at least 61 is new for iron [28]. Variation of the DAD showed again the influence of the control ligand. 4 Scheme 16 The dimerization of butadiene and of norbornadiene demonstrated a comparable reactivity of these two.

Tom Dieck*, Chr. Munz and J. Ehlers Institut fur Anorganische und Angewandte Chemie der Universitat Hamburg, Martin-Luther-King-Platz 6, D-2000 Hamburg 13 (FRG) Transition metal centers can act as electrophiles or nucleophiles and also transfer electrons to or accept electrons from substrates. In addition the metals can act as simple templates and thus impose geometrical factors on two or more substrates. All of these features can be monitored by additional ligands. While for stoichiometric metal centered reactions drastic conditions and changes in the energy content of the metal compound are possible the energetic hypersurface for a good catalytic reaction must be rather smooth relative to the temperature.

The platinacyclopentadiene 39 corresponding to 3 does not react catalytically at ordinary temperatures with EC=CE and dimethylallene, but instead a product was obtained which seemed to be a platina-norbornene 40a , since the CH2 group in this molecule was not symmetrically disposed with respect to the isobutylidene substituent but showed diastereotopism. One of these hydrogen atoms shows a resolved coupling (360 MHz) to one of the methyl groups, and even the second methyl group is broadened, as compared to methyl resonances stemming from DAD substituents (not shown: e.

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