Unexpected Consecutive Propargyl−Allenyl Isomerization in Nucleophilic Trapping Reactions of (arene)Cr(CO)3-Substituted Propargyl Cations
摘要:
Instead of giving rise to the expected propargylated phosphonium salts 4, the addition of triphenylphosphane to (arene)Cr(CO)(3)-substituted alpha -propargyl cations furnishes allenyl phosphonium salts 3 via a prototropic isomerization.