Acetic Anhydride → HCID 21567790, compound

Participants

Reaction Steps

8.65 g of 7-amino-2,3-dihydro-1H-pyrrolo[1,2-a]benzimidazole (2A00) prepared according to W. Reppe Ann. 596 (1955) p. 209 are suspended in 50 cm3 of benzene. To this suspension is added dropwise 6.2 g of acetic anhydride. The mixture is boiled for 15 min and after cooling the precipitated acetyl compound is sucked off. Recrystallization from ethanol yields 7.3 g of 7-acetylamino-2,3-dihydro-1H-pyrrolo[1,2-a]benzimidazole. Melting point: 250°-255°C. Two further recrystallizations from ethanol raise the melting point to 260°-262°C.

Provenance & Evidence