Chemical ionization mass spectrometry of halogenoalkanes with tetramethylsilane as reagent gas

Abstract

Abstract Chemical ionization mass spectra of halogenoalkanes (RX) obtained using tetramethylsilane as reagent gas show two major peaks corresponding to the cluster ion RX + SiMe 3 and alkyl ion R + . Iodides exhibit the highest affinity toward the trimethylsilyl ion and produce the most stable silylated molecular ions, whereas bromides and especially chlorides are less reactive toward Me 3 Si + ions and form less stable [M + SiMe 3 ] + ions.