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|Type:||Artigo de periódico|
|Title:||Carbon-13 Nmr Study Of The Barrier To Internal Rotation Of N,n-dimethylacetamide In The Adduct With Antimony(iii) Chloride|
|Abstract:||The barrier to internal rotation of N,N-dimethylacetamide (DMA) when coordinated to the Lewis acid SbCl 3 was determined from total line-shape analyses of the 13C NMR spectra of the neat liquid adduct SbCl 3·DMA. The Arrenhius energy of activation for the hindered rotation about the CN bond was found to be 73.8 ± 1.1 kJ mol -1, and the enthalpy and entropy of activation, 71.0 ± 1.2 kJ mol -1 and -5 ± 4 J K -1 mol -1, respectively. The rotational barrier in DMA decreases by a small amount on formation of this adduct in contrast with the increase normally observed for similar complexes. The decrease of the rotational barrier is discussed in terms of relative stabilizing effects of adduct formation on the ground and transition states. © 1984 American Chemical Society.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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