Tris(dimethylamino)sulfoniumcyclopentadienide [TAS]+[C5H5]− and Tris(dimethylamino)‐sulfoniumpyrrolide [TAS]+[C4H4N]−: Two Isostructural Salts with “Naked” Anions A− and the “Inverse” Sandwich‐Cations [{(Me2N)3S}2A]+ (A = C5H, C4H4N−)

Abstract

By conversion of the sulfonium salt 1 with the cyclopentadiene 2 the readily soluble salt 3 is obtained in high yield. “Naked” Cp− ions and cations of [{(Me2N)3S}2Cp]+ with an inverse sandwich structure are present in crystals of 3. A variety of silylated N-heterocycles react with 1 in a similar way to form the corresponding salts. These salts are interesting inter alia for their potential use as building blocks in synthesis.