1: 42 percent / diisopropylamide / tetrahydrofuran; hexamethylphosphoric acid triamide / 0 °C 2: 78 percent / acetyl chloride / 6 h / Heating View Scheme

1: 2.7 g / acetyl chloride / 2 h / Heating 2: 800 mg / 1,2-dichloro-ethane / 0.5 h / Ambient temperature; other temp, other solvents 3: 93 percent / methanol; CHCl3 / 2 h / 0 °C 4: 85 percent / LAH / tetrahydrofuran / Ambient temperature View Scheme

1: 2.7 g / acetyl chloride / 2 h / Heating 2: 1,2-dichloro-ethane / 0.5 h / Ambient temperature; other temp, other solvents 3: 3 g / methanol; CHCl3 / 2 h / 0 °C 4: 600 mg / LAH / tetrahydrofuran / 6 h / Ambient temperature View Scheme

1: 2.7 g / acetyl chloride / 2 h / Heating 2: 1,2-dichloro-ethane / 0.5 h / Ambient temperature; other temp, other solvents 3: 3 g / methanol; CHCl3 / 2 h / 0 °C 4: 600 mg / LAH / tetrahydrofuran / 6 h / Ambient temperature 5: 690 mg / pyridine / 16 h / 5 °C 6: 420 mg / LAH / tetrahydrofuran / 6 h / Heating View Scheme

selenium(IV) oxide; xylene Behandeln des Natrium-Salzes der erhaltenen <4-Carboxy-benzo<1,3>dioxol-5-yl>-glyoxylsaeure mit Natriumhydrogensulfit in Wasser und Erhitzen des Reaktionsprodukts auf 120grad;