1: sodium sulfide; diluted NaOH-solution; alcohol 2: pyridine 3: glacial acetic acid; nitric acid 4: concentrated sulfuric acid 5: sodium sulfide; aqueous-alcoholic NaOH-solution View Scheme

1: pyridine 2: glacial acetic acid; nitric acid 3: concentrated sulfuric acid 4: sodium sulfide; aqueous-alcoholic NaOH-solution View Scheme

1: glacial acetic acid; nitric acid / Kochen des entstandenen Gemisches mit Natriumdichromat und Schwefelsaeure in Eisessig unf folgend Verseifen mit konzentrierter Salzsaeure 2: sodium sulfide; aqueous-alcoholic NaOH-solution View Scheme