Influence of the catalyst structure in the cycloaddition of isocyanates to oxiranes promoted by tetraarylstibonium cations. Academic Article uri icon


  • In the context of our work on electron deficient group 15 cations as Lewis acid catalysts, we have synthesized the triflate salts of a series of tetraarylstibonium cations of general formula [ArSbPh3]+ with Ar = Mes (4+), o-(dimethylamino)phenyl (5+), and o-((dimethylamino)methyl)phenyl (6+). These new cationic antimony derivatives, along with the known [Ph4Sb]+ (1+), 1-naphthyltriphenylstibonium (2+), and [(Ant)SbPh3]+ (3+), have been evaluated as catalysts for the cycloaddition of oxiranes and isocyanates under mild conditions. While all stibonium cations favor the 3,4-oxazolidinone products, the reactivities of 5+ and 6+ are hindered by the ancillary amino donor which quenches the Lewis acidity of the antimony center. A comparison of the other stibonium cations shows that 4+ is the most selective catalyst.

published proceedings

  • Dalton Trans

altmetric score

  • 0.25

author list (cited authors)

  • Yang, M., Pati, N., Blanger-Chabot, G., Hirai, M., & Gabba, F. P.

citation count

  • 26

complete list of authors

  • Yang, Mengxi||Pati, Nilanjana||Bélanger-Chabot, Guillaume||Hirai, Masato||Gabbaï, François P

publication date

  • August 2018