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Transacetalization with gaseous carboxonium and carbosulfonium ions

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Journal of the American Society for Mass Spectrometry

Abstract

Primary carboxonium (H2C=O+-R) and carbosulfonium (H2C=S+-R) ions (R = CH3, C2H5, Ph) and the prototype five-membered cyclic carboxonium ion are found to react in the gas phase with cyclic acetals and ketals by transacetalization to form the respective O-alkyl-1,3-dioxolanium and S-alkyl-1,3-oxathiolanium ions. The reaction, which competes mainly with proton transfer and hydride abstraction, initiates by O-alkylation and proceeds by ring opening and recyclization via intramolecular displacement of the carbonyl compound previously protected in its ketal form. As indicated by product ion mass spectra, and confirmed by competitive reactions, carbosulfonium ions are, by transacetalization, much more reactive than carboxonium ions. For acyclic secondary and tertiary carboxonium ions bearing acidic α-hydrogens, little or no transacetalization occurs and proton transfer dominates. This structurally related reactivity distinguishes primary from both secondary and tertiary ions, as exemplified for the two structural isomers H2C=O+-C2H5 and CH3C(H)=O+-CH3. The prototype five- and six-membered cyclic carboxonium ions react mainly by proton transfer and adduct formation, but the five-membered ring ion also reacts by transacetalization to a medium extent. Upon CID, the transacetalization products of the primary ions often dissociate by loss of formaldehyde, and a +44 u neutral gain/−30 u neutral loss MS3 scan is shown to efficiently detect reactive carboxonium and carbosulfonium ions. Transacetalization with either carboxonium or carbosulfonium ions provides a route to 1,3-oxathiolanes and analogs alkylated selectively either at the sulfur or oxygen atom.

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Authors and Affiliations

  1. State University of Campinas-UNICAMP, Campinas, SP, Brazil

    Luiz Alberto B. Moraes, Maria Anita Mendes, Regina Sparrapan & Marcos N. Eberlin

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  1. Luiz Alberto B. Moraes
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  2. Maria Anita Mendes
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  3. Regina Sparrapan
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  4. Marcos N. Eberlin
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Correspondence to Marcos N. Eberlin.

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Moraes, L.A.B., Mendes, M.A., Sparrapan, R. et al. Transacetalization with gaseous carboxonium and carbosulfonium ions. J. Am. Soc. Spectrom. 12, 14–22 (2001). https://doi.org/10.1016/S1044-0305(00)00196-3

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  • DOI: https://doi.org/10.1016/S1044-0305(00)00196-3

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