40 research outputs found

    Zur Stereoanalyse von Diastereomeren 5-C-Ethoxycarbonyl-methylen-hexofuranurono-6, 3-lactonen und-3, 6-Anhydrofuranosen

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    The stereochemistry of the branched C-ethoxycarbonyl-methy.lene derivatives 1a, 1b, 2a, and 2b was evaluated by analysis of their 1H- and 13C-NMR shift data, unequivocally supported by NOE-effects clearly discriminating diastereomers. The X-ray-analysis of isomer 2a confirmed the NMR-data and provided the picture of its detailed structure
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