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vol.56 número3SIMULTANEOUS ESTIMATION OF PIOGLITAZONE, GLIMEPIRIDE AND GLIMEPIRIDE IMPURITIES IN COMBINATION DRUG PRODUCT BY A VALIDATED STABILITY- INDICATING RP-HPLC METHODSTRUCTURAL AND PHOTOPHYSICAL PROPERTIES OF A MONONUCLEAR Re(I) COMPLEX:[P,N-{(C6H5)2(C5H5N)P}Re(CO)3Br] índice de autoresíndice de materiabúsqueda de artículos
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Journal of the Chilean Chemical Society

versión On-line ISSN 0717-9707

Resumen

KLAHN, A. HUGO et al. η2-COORDINATION OF CHLOROBENZENES TO RHENIUM FRAGMENT Cp*Re(CO)2: CHEMICAL AND PHOTOCHEMICAL SYNTHESES OF Cp*Re(CO)2(η2-C6H6-nCln). J. Chil. Chem. Soc. [online]. 2011, vol.56, n.3, pp. 819-822. ISSN 0717-9707.  http://dx.doi.org/10.4067/S0717-97072011000300022.

The complexes Cp*Re(CO)22-C6H6-nCln), 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.

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