Abstract
A stable ethanal...H + ...ethanol proton-bridged dimer (2) by decomposition of CH 3 CH(OC 2 H 5 )CH(OC 2 H 5 )CH 3 +. was formed in the ion source of a Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometer and also in the second field-free region of a reverse-geometry mass spectrometer. Its structure was established with collisional activation and FT-ICR spectra. The formation of this ion is preceded by extensive hydrogen exchanges and carbon rearrangement. These exchanges are the result of reversible isomerizations between a series of ion-neutral complexes and hydrogen- and proton-bondef dimers. FT-ICR experiments reveal a selective substitution of ethanal by C 2 D 5 OH in the proton-bridged dimer 2
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