Collision-induced dissociation of negative ions in the gas phase: [Aryl S]−, [aryl SO]− and [aryl SO2]

Collision‐induced dissociation of the ions [ArS]−, [ArSO]− and [ArSO2]− has uncovered a rich and varied ion chemistry. The major fragmentations of [ArS]− are complex and occur without prior ring hydrogen scrambling: for example, [C6H5S]−→[C2HS]− and [HS]−; [p‐CD3C6H4S]−→[C6H4S]−˙, [CD3C4S]− and [C2HS]−. In contrast, all decompositions of [C6H5CH2S]− are preceded by specific benzylic and phenyl hydrogen interchange reactions. [ArSO2]− and [ArSO2]− ions undergo rearrangement, e.g. [C6H5SO]−→[C6H5O]− and [C6H5S]−; [C6H5SO2]−→[C6H5O] −. The ion [C6H5CH2SO]− eliminates water, this decomposition is preceded by benzylic and phenyl hydrogen exchange.