Abstract
Treatment of the tungsten-η 1 -2,5-dihydropyrrolyl complex 3 with a mixture of Ph 3 CBF 4 and water in cold CH 2 Cl 2 produced the tungsten-η 1 -2,3-dihydropyrrolium cation 7; this cation gradually lost one proton in CH 2 Cl 2 at 23 °C, to yield the tungsten-η 1 -2,3-dihydropyrrolyl species 5.