A triphenylcyclopropenylium mass tag: synthesis and application to ultrasensitive LC/MS analysis of amines.

Thiol adducts of triphenylcyclopropenylium undergo efficient heterolytic dissociation under conditions of both electrospray (ESI) and laser desorption ionization (LDI) mass spectrometry giving rise to a prominent signal of an aromatic C3Ph3(+) cation. A functionalized mass tagging reagent, an activated ester carrying an S-linked C3Ph3 unit, has been developed and used for the derivatization of amines and their subsequent HPLC/ESI-MS detection in low attomolar amounts.

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