Ion kinetic energy spectrometry has been utilized to investigate the loss of CO from [p‐Z‐C6H4‐CO]+ and [C6H5CO]+ ions generated from substituted acetophenones and benzo‐phenones. The variation of the leaving group in forming the [C6H5CO]+ ion has no detectable effect on the kinetic energy release observed in the subsequent decomposition reaction. A substituent effect consistent with the assumption that substituted benzoyl ions have no memory of their origin is also observed.
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Hoffman et al. (1976) studied this question.
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