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Structural and Catalytic Properties of Alkyl-Substituted Phosphanes. Effect of Ortho-Modification on Rhodium-Catalyzed 1-Hexene Hydroformylation

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Abstract

The influence of the alkyl-substituted phosphanes (o-methylphenyl)diphenylphosphane (o-MeP), (o-ethylphenyl)diphenylphosphane (o-EtP), bis(o-methylphenyl)phenylphosphane (o-Me2P), bis(o-ethylphenyl)phenylphosphane (o-Et2P), and (2,4,5-trimethylphenyl)diphenylphosphane (2,4,5-MeP) was screened in model reaction of rhodium-catalyzed 1-hexene hydroformylation. Compared with PPh3, the prepared phosphanes afforded lower chemoselectivity towards aldehydes, but increased the normal to branched ratio. Catalyst results are discussed in relation to stereoelectronic properties of the phosphane ligands. Electron donor capacity of the ligands was studied in terms of spectroscopic data of the trans-RhCl(CO)P2 species, formed in reaction between Rh2(μ-Cl)2(CO)4 and the ligands (P). Furthermore, steric attributes of free and bound phosphanes were investigated by Tolmans cone angle method. Crystal structures for ligands o-EtP, o-Me2P, o-Et2P, and complexes trans-Rh(CO)Cl(o-MeP)2 and trans-Rh(CO)Cl(o-Et2P) were solved as well.

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Authors and Affiliations

  1. Department of Chemistry, University of Joensuu, PO Box 111, FIN-80101 Joensuu, Finland

    Pekka Suomalainen, Sirpa Jääskeläinen, Matti Haukka & Tapani A. Pakkanen

  2. Department of Chemistry, University of Oulu, PO Box 3000, FIN-90401 Oulu, Finland

    Helena Riihimäki & Jouni T. Pursiainen

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  1. Pekka Suomalainen
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  2. Helena Riihimäki
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Suomalainen, P., Riihimäki, H., Jääskeläinen, S. et al. Structural and Catalytic Properties of Alkyl-Substituted Phosphanes. Effect of Ortho-Modification on Rhodium-Catalyzed 1-Hexene Hydroformylation. Catalysis Letters 77, 125–130 (2001). https://doi.org/10.1023/A:1012751515156

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