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Influence of the Diphosphine Coordinated to Molybdenum and Tungsten Triangular M3S4 Cluster Hydrides in the Catalytic Hydrodefluorination of Pentafluoropyridine

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Abstract

Hydrido molybdenum and tungsten(IV) cluster cations of formula [M3S4H3(dppe)3]+ (dppe = 1,2-(bis)dimethylphosphinoethane), [Mo-1]+ (M = Mo) and [W-1]+ (M = W), have been isolated by reacting their halide precursors with borohydride. Synthetic procedures have been optimized by appropriate choice of the solvent. Furthermore, [M3S4F3(dppe)3]+ fluorido cluster complexes, [Mo-2]+ (M = Mo) and [W-2]+ (M = W) have been prepared through halogen substitution reactions using an excess of cesium fluoride. The structures of [Mo-1]+ and [Mo-2]+ have been determined by single crystal X-ray diffraction experiments. These [M-1]+ hydrido and [M-2]+ fluorido clusters have been used as catalysts and precatalysts, respectively, in the catalytic hydrodefluorination (HDF) of pentafluoropyridine using HSiMe2Ph as hydrogen source. The reaction proceeds under microwave and reflux conditions to selectively afford 2,3,5,6-tetrafluoropyridine. The [W-1]+ hydrido cluster is the most efficient catalyst with turnover numbers of 124, while the [Mo-1]+ hydrido cluster reacts faster. Fluorido [Mo-2]+ and [W-2]+ complexes provide lower yields and turnover numbers. In general, the molybdenum and tungsten [M-1]+ and [M-2]+ diphosphino complexes are more efficient than their dmpe (1,2-(bis)dimethylphosphinoethano) analogues and activate pentafluoropyridine under softer conditions.

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Acknowledgments

The financial support of the Spanish Ministerio de Economía y Competitividad (Grant CTQ2011-23157), Universitat Jaume I (Research Project P1·1B2013-19) and Generalitat Valenciana (ACOMP/2013/215 and Prometeo/2009/053) is gratefully acknowledged. The authors also thank the Servei Central d’Instrumentació Científica (SCIC) of the University Jaume I for providing us with the mass spectrometry, NMR and X-ray facilities. C.A. thanks the Spanish Ministerio de Economía y Competitividad for a predoctoral fellowship (FPI).

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Authors and Affiliations

  1. Departament de Química Física i Analítica, Universitat Jaume I, Av. Sos Baynat s/n, 12071, Castellón de la Plana, Spain

    Carmina Alfonso, Tomás F. Beltrán & Rosa Llusar

  2. Instituto de Tecnología Química, CSIC-UPV, Avda. de los Naranjos s/n, 46022, Valencia, Spain

    Marta Feliz

Authors
  1. Carmina Alfonso
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  2. Tomás F. Beltrán
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  3. Marta Feliz
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  4. Rosa Llusar
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Correspondence to Rosa Llusar.

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Alfonso, C., Beltrán, T.F., Feliz, M. et al. Influence of the Diphosphine Coordinated to Molybdenum and Tungsten Triangular M3S4 Cluster Hydrides in the Catalytic Hydrodefluorination of Pentafluoropyridine. J Clust Sci 26, 199–209 (2015). https://doi.org/10.1007/s10876-014-0733-1

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  • DOI: https://doi.org/10.1007/s10876-014-0733-1

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