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Das Kondensationsprodukt scheidet sich fast augenblicklich als gelb-brauner Niederschlag ab. Zur Vervollstandigung der Reaktion erwarmt man zweckmaflig noch einige Zeit auf 50 OC. Das schon ziemlich rein anfallende Rohprodukt
wird aus Dimethylformamid umkristallisiert, Fp (Berllock) 377-378 (unkorr.).

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