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The protonation and methylation of thiophenol (C 6 H 5 SH), thioanisole (C 6 H 5 SCH 3 ) and 4-bromo derivatives have been studied using both tandem mass spectrometric techniques and ab initio quantum chemical calculations. Protonated 4-bromo thio-compounds produced by chemical ionization (CI) are found to be collisionally dehalogenated in an rf-only quadrupole...
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