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Sci., Part A"},{"key":"ref11\/cit11","doi-asserted-by":"crossref","first-page":"2501","DOI":"10.1016\/S0040-4039(00)97400-8","volume":"31","author":"Boivin J.","year":"1990","journal-title":"Tetrahedron Lett."},{"key":"ref11\/cit11b","doi-asserted-by":"crossref","first-page":"391","DOI":"10.1021\/ol9900562","volume":"1","author":"Takasu K.","year":"1999","journal-title":"Org. Lett."},{"key":"ref12\/cit12a","doi-asserted-by":"crossref","first-page":"2065","DOI":"10.1139\/v70-344","volume":"48","author":"Fraser R. R.","year":"1970","journal-title":"Can. J. Chem."},{"key":"ref12\/cit12b","unstructured":"bGiven the suitable spatial arrangement of the CF3moiety towards a possible intramolecular migration of a fluorine atom to the radical center, we have carried out the theoretical study of this step in order to evaluate its competitiveness in the reaction conditions. As shown by the calculations, this is an endothermic process (\u0394G= 5.0 kcal mol\u22121) with a very high free activation energy, \u0394G\u29e7, of 55.0 kcal mol\u22121(activation enthalpy, \u0394H\u29e7= 53.1 kcal mol\u22121). A comparison with the calculated values for the intermolecular reaction (\u0394G\u29e7\u2248 20 kcal mol\u22121) shows that this process appears to be clearly unfavored and hardly achievable in the reaction conditions."},{"key":"ref13\/cit13","doi-asserted-by":"crossref","first-page":"8019","DOI":"10.1021\/jo701536a","volume":"72","author":"Armstrong A.","year":"2007","journal-title":"J. Org. Chem."},{"key":"ref14\/cit14a","doi-asserted-by":"crossref","first-page":"6496","DOI":"10.1021\/ja000673h","volume":"122","author":"Ollivier C.","year":"2000","journal-title":"J. Am. Chem. Soc."},{"key":"ref14\/cit14b","unstructured":"bThe tested conditions included (i) ethanosulfonylazide, AIBN and slow addition of HSnBu3in toluene under reflux, (ii) ethanosulfonylazide, AIBN, ClSnBu3, NaBH3CN intBuOH at 100 \u00b0C, and (iii) sodium azide, AIBN and ClSnBu3in toluene under reflux. In all cases the starting material was either recovered unchanged or detected by1H NMR as the major product."},{"key":"ref15\/cit15","unstructured":"Reference deleted in proof."},{"key":"ref16\/cit16","doi-asserted-by":"crossref","first-page":"3379","DOI":"10.1016\/S0968-0896(02)00239-0","volume":"10","author":"Herr R. J.","year":"2002","journal-title":"Bioorg. Med. Chem."},{"key":"ref17\/cit17a","doi-asserted-by":"crossref","first-page":"2395","DOI":"10.1021\/jo00007a027","volume":"56","author":"Duncia J. V.","year":"1991","journal-title":"J. Org. 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