Chiroptical properties of pyranoid glycols in the presence of [Mo2(O[2CCH3)4]

András Lipták, Jadwiga Frelek, Günther Snatzke, Iontscho Vlahov

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Bindentate complexes between [Mo2(O2CCH3)4] and suitable diols from the sugar series show Cotton effects around 500 to 450 (CD band I), 400 (II), 350 (III), and 300 nm (IV), and additional effects at still shorter wavelengths. The sign of Cotton effect IV is identical with the sign of the torsional angle HOCCOH for vic-diols. With this rule the absolute configurations of open-chain vic-diols of the threo-configuration and of vicinal primary-secondary diols can be determined with small amounts of substance; for the application of the rule the torsional angle(s) HOCCC should be fixed at 180°. Cotton effect III is only strong for vic-diols having a pyranose ring if no axial RO group is adjacent to the glycol moiety. Complexes of diols of pyranose structure carrying free hydroxyls at C-4 and C-6 show much smaller Δε values.

Original languageEnglish
Pages (from-to)149-159
Number of pages11
JournalCarbohydrate Research
Issue numberC
Publication statusPublished - Jul 1 1987

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Organic Chemistry

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