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

René Csuk Institut für Organische Chemie, Techn. Univ., Graz Stremayrgasse 16, A-8010, Graz, Österreich

Alois Fürstner Institut für Organische Chemie, Techn. Univ., Graz Stremayrgasse 16, A-8010, Graz, Österreich

Hermann Kalchhauser Institut für Organische Chemie, Univ. Wien, Währingerstraβe 38, A-1090, Wien, österreich

Christoph Kratky Instirut für Physikalische Chemie, Univ. Graz, Heinrichstraβe 28, A-8010, Graz, österreich

Ulrike Wagner Instirut für Physikalische Chemie, Univ. Graz, Heinrichstraβe 28, A-8010, Graz, österreich

Hans Weidmann Institut für Organische Chemie, Techn. Univ., Graz Stremayrgasse 16, A-8010, Graz, Österreich

Abstract

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

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

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