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In die Lösung von 18.2g III in 150ccm Petroläther wurde Phosgen eingeleitet, wobei sich unter schwacher Erwärmung farblose Kristalle ausschieden. Nach Beendigung der Umsetzung wurde abgesaugt, die Kristalle mit Petroläther gewaschen, getrockent und aus Acetonitril umkristallisiert.

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