By Hans Meyer

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H. Bestimmung der Phenole aIs Oxyazokorper. Mit D i a z 0 k 0 r per n geben Phenole, in denen die Parastellung oder eine der beiden Orthostellungen unbesetzt ist 2), Oxyazokorper von meist intensiv roter oder rotgelber Farhe. Als D i a z 0 k 0 mponente verwendet man zweckmiissig entweder diazotierte Sul£an iIs aure 3) oder D ia zo par an i tr 0 a n ilin. Letzteres Reagens verwendet Bader 4 ), um Phenole quantitativ als Azofarbstoffe zu fallen. Die Reaktion verliiuft nach der Gleichung: C6 H 4 N0 2N: NCl+C6 H 5 0H+ 2 NaOH=C6H4N02N:NC6H40Na + NaCl + 2 H 20.

Es ist also diese Reaktioll eine Umkehrung del' Amillbestimmullgsmethode von Hirsch. K. Darstellung von Dinitrophenyliithern (Willgerodt) 1). Die leichte Beweglichkeit des Ohlors irn 1. 4 Dinitrobenzol e1'rnoglicht die Bildung der verschiedensten Dinitrophenyliither. Man lost das Ohlol'dinitrobenzol in der betl'effenden Alkoholart auf, setzt auf je 1 g desselben 0,25 g Xtzkali (in dern gleichen Alkohol gelost) zu und e1'wiirmt, falls notwendig, zur Beendigung der Reaktion. Die Kalilosung bereitet man so, dass man das Xtzkali zuerst in Wasser lost und dann mit der gleichen Alkoholrnenge versetzt.

Von hier gelangen die Diimpfe in einen vertikal gestellten Kugelkiihler, der mittelst eines Kautschukstiipsels in eine Druekflasche von 3/4 I Inhalt so eingesetzt ist, dass die verIangerte Kiihlrohre bis zum Boden Acetylbestimmung. 21 der Flasehe reieht. Diese dient zur Aufnahme der vorgelegten Kalilauge und wird dureh einen Glashahn mit der Pumpe verbunden. FUr die Verbindungen zwischen den einzelnen Teilen ist nul' guter Kautschuk zu verwenden und weiter ist auch zu beachten, dass del' Glashahn am Tropftrichter sehr gut schliessen muss, weil sonst die ins Vakuum eingesaugte oft saure Laboratoriumsluft Fehler bedingen wUrde.

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