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• W2012188373 abstract "The fragmentation mechanisms of protonated triglycine and its first-generation dissociation products have been investigated using a combination of density functional theory calculations and threshold collision-induced dissociation experiments. The activation barrier measured for the fragmentation of protonated triglycine to the b(2) ion and glycine is in good agreement with a calculated barrier at the B3LYP/6-31++G(d,p) level of theory reported earlier [Rodriquez, C. F. et al. J. Am. Chem. Soc. 2001, 123, 3006-3012]. The b(2) ion fragments to the a(2) ion via a transition state structure that is best described as acylium-like. Contrary to what is commonly assumed, the lowest energy structure of the a(2) ion is not an iminium ion, but a cyclic, protonated 4-imidazolidone. Furthermore, fragmentation of the b(2) to the a(1) ion proceeds not via a mechanism that results in HNCO and H(2)C=C=O as byproducts, as have been postulated, but via a transition state that contains an incipient a(1) ion and an incipient carbene. The fragmentation of a(2) to a(1) proceeds via a transition state structure that contains the a(1) ion, CO and an imine as incipient components." @default.
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• W2012188373 date "2003-07-01" @default.
• W2012188373 modified "2023-10-11" @default.
• W2012188373 title "Elucidation of Fragmentation Mechanisms of Protonated Peptide Ions and Their Products: A Case Study on Glycylglycylglycine Using Density Functional Theory and Threshold Collision-Induced Dissociation" @default.
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• W2012188373 doi "https://doi.org/10.1021/ja0207293" @default.
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