The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《The acylation of furan and thiophene with aliphatic anhydrides in the presence of boron trifluoride etherate》. Authors are Heid, John V.; Levine, Robert.The article about the compound:1-(Furan-2-yl)propan-1-onecas:3194-15-8,SMILESS:O=C(C1=CC=CO1)CC).Recommanded Product: 3194-15-8. Through the article, more information about this compound (cas:3194-15-8) is conveyed.
The best yields (77%) of 2-acetylfuran, b6 45-8°, were obtained when 14 g. of redistilled BF3.Et2O was added all at once to 68 g. (1 mol.) furan and 123 g. (1.15 mols.) 95% Ac2O at 0°, the mixture stirred at room temperature 0.5 hr., hydrolyzed with 200 ml. H2O, and the product isolated in the usual way. In a similar manner, 81% 2-propionylfuran, b6 61-3°, 93% 2-butyrylfuran, b7 76-8°, 73% 2-acetylthiophene, b7 80-1°, 79% 2-propionylthiophene, b6 88-9° (semicarbazone m. 172.5-3.5°), and 89% 2-butyrylthiophene, b4 96°, were obtained. A possible reaction mechanism is proposed.
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Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – PubChem