Preparation of Chiral and Achiral Triazolium Salts: Carbene Precursors with Demonstrated Synthetic Utility

Abstract 4,4a,9,9a‐Tetrahydro‐1‐oxa‐4‐azafluoren‐3‐one (1 R , 2 S )‐(+)‐ cis ‐!‐Amino‐indol 2‐Pentafluorophenyl‐6,10b‐dihydro‐4 H ,5a H ‐5‐oxa‐3,10c‐diaza‐2azoniacyclopenta[ c ]fluorene;tetraborate Trimethyloxonium tetrafluoroborate Pentafluorophenyhydrazine