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Fourier transform ion cyclotron resonance study of ion-molecule reactions of [M – OCH3]+ ions of methyl 2,3,4,6-tetra-O-methyl-d-hexopyranosides with ammonia

✍ Scribed by Vladimir Kovacik; Janos Hirsch; Detlef Thölmann; Hans-Friedrich Grützmacher

Publisher
John Wiley and Sons
Year
1991
Tongue
English
Weight
354 KB
Volume
26
Category
Article
ISSN
1076-5174

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✦ Synopsis

Dedicated to Professor Kurt Heyns to thank him for the excellent training in carbohydrate chemistry and mass spectrometry

Glycosidic oxocarbenium ions A, + were formed by isobutane chemical ionization from methyl 2,3,4,6-tetra-0methyl-gD-mannopyranoside, methyl 2,3,4,6-tetra-0-methyl-gD-gahctopyranoside and methyl 2,3,4,Ctetra-0methyl-gD-glucopyran~ide (the ring -0-being converted into -&),

and their reaction with ammonia was studied by Fourier transform ion cyclotron resonance spectrometry. Very slow formation (reaction efficiency 0.6-1.4%) of the adduct ion [A, + NH3J* was observed as the main process for carefully thermalid ions A,+.

Interestingly, the efficiency of the adduct ion formation depends on the sterochemistry of ions A,'.

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