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Synthesis 2007(2): 277-283  
DOI: 10.1055/s-2006-958944
PAPER
© Georg Thieme Verlag Stuttgart · New York

Synthesis of Bimetallic Iron-Chromium and Iron-Manganese Complexes with Conjugated Benzodithiophene-Based Spacers

Ming Lia, Nassima Riachea, Jean-Philippe Tranchiera, Françoise Rose-Munch*a, Eric Rose*a, Patrick Hersonb, Alberto Bossic, Clara Rigamontic, Emanuela Licandroc
a Université Pierre et Marie Curie Paris 6, Laboratoire de Chimie Organique (UMR 7611), Institut de Chimie Moléculaire (FR 2769), Case 181, 4 place Jussieu, 75252 Paris Cedex 05, France
Fax: +33(1)44275504; e-Mail: rose@ccr.jussieu.fr; e-Mail: rosemun@ccr.jussieu.fr;
b Université Pierre et Marie Curie Paris 6, Laboratoire de Chimie Inorganique et Matériaux Moléculaires (UMR 7071), Case 42, 4 place Jussieu, 75252 Paris Cedex 05, France
c Department of Organic and Industrial Chemistry, University of Milan, Via C. Golgi, Milan, 20133, Italy
Fax: +39(02)50314139; e-Mail: emanuela.licandro@unimi.it;
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Publication History

Received 22 June 2006
Publication Date:
14 December 2006 (online)

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Abstract

Palladium-catalyzed Sonogashira coupling reactions of an ethynylferrocene complex, [η6-phenylethynyl]tricarbonyl chromium and [η5(1-5)-1-ethynyl-4-methoxycyclohexa-2,4-dienyl]tricarbonyl manganese with a 2-iodobenzodithiophene derivative lead to the formation of mononuclear complexes. Similarly, condensation of the iodo derivative of one of these complexes with the [η6-phenylethynyl]tricarbonyl chromium and [η5(1-5)-1-ethynyl-4-methoxycyclohexa-2,4-dienyl]tricarbonyl manganese complexes affords bimetallic iron-chromium and iron-manganese complexes. Upon hydride abstraction, the manganese derivatives give the corresponding (η6-arene) cations. The structure of the neutral bimetallic iron-manganese complex has been investigated by X-ray diffraction study.

Key words

chromium - manganese - iron - cross-coupling - arene complexes