Abstract
AbstractMetastable protonated butylbenzenes have been studied by extensive labelling and kinetic energy release measurements. Protonated s‐butylbenzene isomerizes by 1–2 hydrogen shift to the π complex [C6H6 SC4H], and the SC4H cation rearranges to t‐C4H. The interconversion between [C6H6 SC4H] and [C6H C4H8] ion/neutral complexes is demonstrated. Protonated t‐butylbenzene reacts without hydrogen exchange to give t‐C4H, while protonated n‐butylbenzene isomerizes to s‐butylbenzene prior to dissociation. Protonated iso‐butylbenzene isomerizes to protonated t‐butylbenzene and to protonated s‐butylbenzene. In the 2nd field‐free region, the dissociation of this last form predominates.
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