Abstract: | Water elimination from ionized n-butanol reflects near randomization of all hydrogens in ions decomposing after ~10?5s. This probably takes place in ion-neutral complexes by formation of a cyclobutane ion–H2O complex and/or rearrangement within C4H8]+˙ in open-chain C4H8+˙? H2O] complexes, in either case accompanied by hydrogen exchange between water and open-chain hydrocarbon moieties. Extensive hydrogen rearrangements in which restraints on conventional transition-state ring size have little apparent influence may generally be ion–neutral complex-mediated processes. |