TY - JOUR
T1 - Collisionally-induced dissociation mass spectra of organic sulfate anions
AU - Attygalle, A. B.
AU - García-Rubio, S.
AU - Ta, J.
AU - Meinwald, J.
PY - 2001
Y1 - 2001
N2 - The collisionally-induced dissociation mass spectra of a variety of organic sulfate ester anions are described and mechanistically rationalized. A cyclic syn-elimination pathway, analogous to that of the Cope elimination, is postulated for the commonly observed formation of bisulfate anion (HSO4-, m/z 97). Deuterium labeling experiments confirm that the proton transferred to oxygen during bisulfate elimination normally originates from the C-2 position, although examination of the spectra of polyfunctional steroids reveals that the proton abstracted may originate from more distant sites as well. Adamantyl, phenyl, and vinyl sulfate anions, which do not readily lend themselves to a cyclic syn-elimination, do not give rise to an m/z 97 ion. Instead, these sulfates undergo both heterolytic and homolytic S-O bond cleavages to yield an m/z M - 80 anion, resulting from loss of neutral SO3, as well as an ion at m/z 80, corresponding to SO3-·, respectively. Sulfates that can give rise to a resonance stabilized radical by homolytic C-O bond fission, as exemplified by benzyl and linalyl sulfates, can be recognized by the formation of an m/z 96 (SO4-·) ion.
AB - The collisionally-induced dissociation mass spectra of a variety of organic sulfate ester anions are described and mechanistically rationalized. A cyclic syn-elimination pathway, analogous to that of the Cope elimination, is postulated for the commonly observed formation of bisulfate anion (HSO4-, m/z 97). Deuterium labeling experiments confirm that the proton transferred to oxygen during bisulfate elimination normally originates from the C-2 position, although examination of the spectra of polyfunctional steroids reveals that the proton abstracted may originate from more distant sites as well. Adamantyl, phenyl, and vinyl sulfate anions, which do not readily lend themselves to a cyclic syn-elimination, do not give rise to an m/z 97 ion. Instead, these sulfates undergo both heterolytic and homolytic S-O bond cleavages to yield an m/z M - 80 anion, resulting from loss of neutral SO3, as well as an ion at m/z 80, corresponding to SO3-·, respectively. Sulfates that can give rise to a resonance stabilized radical by homolytic C-O bond fission, as exemplified by benzyl and linalyl sulfates, can be recognized by the formation of an m/z 96 (SO4-·) ion.
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U2 - 10.1039/b009019k
DO - 10.1039/b009019k
M3 - Article
AN - SCOPUS:0034743813
SN - 1470-1820
SP - 498
EP - 506
JO - Journal of the Chemical Society, Perkin Transactions 2
JF - Journal of the Chemical Society, Perkin Transactions 2
IS - 4
ER -