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Oxazolonium ions, formation

FIGURE 8.20 Peptides activated at an IV-methylamino-acid residue are postulated to epimer-ize because of the formation of the oxazolonium ion. Evidence for the latter resides in spectroscopic studies,96 and the isolation of a substituted pyrrole that was formed when methyl propiolate was added to a solution of Z-Ala-MeLeu-OH in tetrahydrofuran 10 minutes after dicyclohexylcarbodiimide had been added.95 The acetylenic compound effected a 1,3-dipolar cycloaddition reaction (B), with release of carbon dioxide, with the zwitter-ion that was generated (A) by loss of a proton by the oxazolonium ion. [Pg.275]

See other pages where Oxazolonium ions, formation is mentioned: [Pg.277]    [Pg.238]    [Pg.277]    [Pg.238]    [Pg.223]    [Pg.275]    [Pg.572]    [Pg.711]   
See also in sourсe #XX -- [ Pg.95 ]

See also in sourсe #XX -- [ Pg.95 ]

See also in sourсe #XX -- [ Pg.95 ]



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2 -oxazolonium

Formate ion

Ion formation

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