η²-coordination of chlorobenzenes to rhenium fragment cp*re(co)2: Chemical and photochemical syntheses of cp*re(co)2(η²-c6h6-ncl n)

• A. HUGO KLAHN ^[1] ; VERÓNICA MORALES ^[1] ; BEATRIZ OELCKERS ^[1] ; GONZALO E BUONO-CORE ^[1] ; JOHAND GOMEZ ^[1] ; FERNANDO GODOY ^[2]
  1. [1] Pontificia Universidad Católica de Valparaíso

     Pontificia Universidad Católica de Valparaíso

     Valparaíso, Chile

     
  2. [2] Universidad de Santiago de Chile

     Universidad de Santiago de Chile

     Santiago, Chile

     
• Localización: Journal of the Chilean Chemical Society (Boletín de la Sociedad Chilena de Química), ISSN-e 0717-6309, ISSN 0366-1644, Vol. 56, Nº. 3, 2011, págs. 819-822
• Idioma: inglés
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• Resumen

  • The complexes Cp*Re(CO)2(η²-C6H6-nCl n), n = 4, (5,6-η²-1,2,3,4-C6H2Cl4) 2a; n = 3, (5,6-η²-1,2,4-C6H3Cl3) 2b; n = 2, (2,3-η²-1,4-C6H4Cl2) 2c and (4,5-ç²-1,3-C6H4Cl2) 2d, have been conveniently prepared by two alternative procedures: Directly, by the photochemical reaction of Cp*Re(CO)2(N2) in neat or saturated hexane solution of the corresponding partially chlorinated benzene or stepwise, by the reaction of the appropriate trans-Cp*Re(CO)2(ArCl)X, X = Cl, Br (1a-d) with LiBHEt3 followed by protonation with HCl to form the hydrido complexes trans-Cp*Re(CO)2(ArCl)H which resulted thermally unstable in solution and convert to η ²-coordination complexes 2a-d. Due to their low stability as solids and in solution, the new complexes were only characterized by IR and ¹H and 13C NMR spectroscopy. The ¹H NMR spectra of the two derivatives containing dichlorobenzene (2c and 2d) indicate that a rapid exchange occurs between the hydrogen atoms on the coordinated carbons and those on the non-coordinated carbons.