Phenyl-2,6-bis(oxazole) ligands have been explored for the synthesis of novel palladium(II) and platinum(II) pincer complexes. The materials were characterized by spectroscopic methods and by X-ray crystallography. Investigations of the photophysical properties revealed that the lowest triplet states of the materials are largely centred at the bis(oxazole) ligands. The platinum(II) compounds are moderately emissive in fluid solution at ambient temperature. Introduction of both strong donors and strong acceptors leads to a significant red shift of the emission. Due to the facile synthesis of bis(oxazole) based complexes with electronically tuneable oxazole moieties, these materials might be promising alternatives to the well-established phenyl-2,6-bipyridyl systems.

A bridge connects and efficiently transfers the chirality from the backbone of a N-heterocyclic carbene (NHC) to the metal center. The result is excellent enantioselectivities in the ruthenium-catalyzed, asymmetric ring-opening cross-metathesis of norbornenes with allyltrimethylsilane (see scheme). Detailed facts of importance to specialist readers are published as "Supporting Information". Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.

Eine Brücke verbindet …︁ und überträgt damit die Chiralität effizient vom Rückgrat eines N-heterocyclischen Carbens auf das Metallzentrum in einem neuartigen Olefinmetathesekatalysator. Damit wurden exzellente Enantioselektivitäten in der Ruthenium-katalysierten asymmetrischen Ringöffnungskreuzmetathese von Norbornenen mit Allyltrimethylsilan erzielt (siehe Schema). Detailed facts of importance to specialist readers are published as "Supporting Information". Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.

Introducing bis(oxazole) ligands to catalysis: novel bis(oxazole) ligands could be readily synthesized from isophthaloyl dichlorides and ethyl glycinate hydrochlorides or 6-aminoacetophenone hydrochloride. Their corresponding pincer palladium complexes proved to be extremely robust catalysts for Suzuki-Miyaura cross coupling reactions, allowing the synthesis of biaryls under aerobic conditions with turn over numbers of up to 790,000 and turn over frequencies of up to 49,000h(-1). (c) 2007 Elsevier B.V. All rights reserved.

In einem Arbeitsgang: Ein einziger Rutheniumcarbenkomplex katalysiert eine Abfolge zweier Reaktionen, nämlich eine Metathese (Ringschluss- oder Kreuzmetathese) und im Anschluss daran die Dihydroxylierung der entstandenen Doppelbindung. Mehrere cyclische und acyclische cis-Diole konnten in sehr guten Ausbeuten synthetisiert werden (siehe Schema). Die Methode bietet sich als Alternative zur Pinakol-Kupplung an. Hintergrundinformationen zu diesem Beitrag sind im WWW unter http://www.wiley-vch.de/contents/jc_2001/2006/z503552_s.pdf zu finden oder können beim Autor angefordert werden. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.

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