1-phenyl-3-(trifluormethansulfonyl)-propadien

For the first time a perfluoroalkanesulfonylallene, the 1-phenyl-3-(trifluoromethanesulfonyl)-propadiene ($\text{5}$) was synthesized. $\text{5}$ is $\text{5}$ reacts already at room temperature with cyclopentadiene to form the adduct $\text{6}$.