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Nur f¨¹r Verbindung 1 ist A entschirmter als B,zweifellos als Folge der entschirmenden Wirkung der benachbarten Phenyl-Gruppe.
Die durch die räumliche Nachbarschaft der beiden Sauerstoffatome 2 und 4 bzw. 8 und 10 bedingte Entschirmung von 3 ist viel größer als jene des unmittelbar an 93 gebundenen Protons A des Fragments 8910 bzw.234.
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[ Last edited by hxsjh on 2010-12-31 at 18:36 ]

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