(5aS,10bR)-(-)-5a,10b-Dihydro-2-(pentafluorophenyl)-4H,6H-indeno[2,1-b][1,2,4]trizolo[4,3-d][1,4]oxazinium tetrafluoroborate (contains 15-20% minor isomer)

Technical Notes：
1.Used in triazolium-catalyzed carbocyclization of carbohydrate - derived dialdehydes to produce allo- and epi-inositol.
2.Triazolium catalyst for enantioselective Darzens reactions.
3.Catalyst for L ewis acid assisted reaction of 2-aroylvinylcinnamaldehydes to produce indeno-[1 ,2-c]furan-1- one derivatives.
4.Catalyst for asymmetric desymmetrization of 1 ,3-Diketones via Intramolecular benzoin reaction.
5.Catalyst for asymmetric synthesis of spirobenzazepinones with atroposelectivity and spiro-1,2-diazepinones by [3+4] annulation reactions.
6.Catalysis for a highly enantioselective [4+2] annulation.