title: A study of the gas-phase reaction between protonated acetaldehyde and methanol.
abstract: Protonated acetaldehyde is methylated on the oxygen during interaction with methanol in the gas phase. The ionic product of the iomnolecule reaction between methanol and protonated acetaldehyde is identical with C-protonated methylvinyl ether (high-pressure ionization), and with the (M - C2H5)(+) fragment ion of sec-butyl methyl ether (following electron ionization), and also with the (M - OCH3)(+) fragment ion of acetaldehyde dimethylacetal (following electron ionization). The structures of these ions and the mechanism of their formation were established by isotope-labeling experiments and collision-induced dissociation mass spectra of model compounds obtained with three different types of tandem mass spectrometers (BEQQ, triple-quadrupole, and a penta-quadrupole instrument). Gas phase synthesis of the product ion from [(2)H3]-methanol or [(2)H 4]-acetaldehyde provided insight into its mode of formation and collision-induced dissociation. (J Am Soc Mass Spectrom 1990, 1, 481-488).
authors.affiliation: Chemistry, Michigan State University, 48824, East Lansing, Michigan, USA.
authors.forename: G G
authors.initials: GG
authors.lastname: Dolnikowski
authors.forename: T G
authors.initials: TG
authors.lastname: Heath
authors.forename: J T
authors.initials: JT
authors.lastname: Watson
authors.forename: J H
authors.initials: JH
authors.lastname: Scrivens
authors.forename: C H
authors.initials: CH
authors.lastname: Rolando