Negative-Ion Mass Spectrometry of Carbohydrates. A Mechanistic Study of the Fragmentation Reactions of Dideoxy Sugars
摘要:
Hydroxyl group deprotonation of the alpha and beta anomers of methyl 3-O-benzyl-2,6-dideoxy-D-arabino-hexopyranoside (1 and 2) occurs readily in the gas phase to produce the corresponding anions 3 and 4, respectively. Collisionally activated dissociation (CAD) of these anions causes fragmentation reactions that include ring opening, E2 elimination, and decarbonylation. Mechanisms for these reactions are proposed, and these mechanisms are supported by study of partially deuterated analogs of 1 and 2.