authentic sample. The aqueous layer was acidified (hydrochloric acid) and extracted (ether). Evaporation of ether gave 0.41 g (68%) of diphenylacetic acid (13). Recrystallization of 13 from benzene gave colorless granules, mp 147-148 °C. The melting point and IR spectrum of 13 were in good agreement with those of an authentic sample.
Aus den Cyclopropylketonen (I) erhält man mit sekundären cyclischen Aminen (II) unter Spaltung des Ringes die Addukte (III); die spezielle Verbindung (VIII) wird unabhängig nach bekannten Verfahren aus Acetessigester (IV) über die Zwischenstufen (VI) und (VIIa) und (VIIb) hergestellt.
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