Diphenyl Ether誘導体に於けるFriedel-Crafts反応 (第9報)

キサンテノール誘導体の生成に就いて

抄録

The reaction whereby the application of acetyl chloride to 4-methoxy-4′-methyl-or 2, 3-dimethoxy-4′-methyl-diphenyl ether results in the occurrence of xanthenol cyclization to form the corresponding xanthone compounds was examined. It was found that the same xanthenol cyclization occurred with 2-acetyl-, 2-acetyl-4, 4′-dimethyl-, 2-acetyl-4, 5-dimethoxy-, 2-acetyl-5, 6-dimethoxy-4′-methyl-, and 2-benzoyl-diphenyl ethers, with carbon disulfide as the solvent and in the presence of aluminum chloride, and when conc. sulfuric acid was added. Some presumptions on such abnormal reaction mechanism were forwarded.