A process is provided for the production of 6-hydroxy-2-naphthones, e.g., 6-hydroxy-2-acetonaphthone, by contacting a 2-naphthyl carboxylate ester, e.g., 2-naphthyl acetate with at least 20 moles of hydrogen fluoride per mole of 2-naphthyl ester, at reaction temperatures, e.g., 0 to 100° C for a period of reaction, e.g., 30 minutes to 8 hours sufficient to produce the desired amount of 6-hydroxy-2-naphthone. The process may utilize a carboxylic acid or anhydride, e.g., acetic acid or anhydride as an additive for the purpose of further increasing the regioselectivity of the 6-hydroxy-2-naphthone product. The process is capable of being carried out at a conversion of 2-naphthyl ester of at least 90% and a regioselectivity to 6-hydroxy-2-naphthone of at least 90 mol %.
本发明提供了一种生产 6-羟基-2-
萘酮(如 6-羟基-2-乙酰
萘酮)的工艺,其方法是将 2-
萘基
羧酸酯(如 2-
萘基
乙酸酯)与每摩尔 2-
萘基酯至少 20 摩尔的
氟化氢接触,在反应温度(如 0 至 100 摄氏度)下反应一段时间(如 0 至 100 摄氏度)、
2-萘乙酸酯与每摩尔 2-
萘酯至少 20 摩尔的
氟化氢接触,反应温度如 0 至 100 摄氏度,反应时间如 30 分钟至 8 小时,足以生成所需数量的 6-羟基-2-
萘酮。为了进一步提高 6-羟基-2-
萘酮产物的区域选择性,该工艺可使用
羧酸或酸酐,如
乙酸或酸酐作为添加剂。该工艺的 2-
萘酯转化率至少为 90%,6-羟基-2-
萘酮的区域选择性至少为 90 摩尔%。