The structure of isoanhydromethyldihydrousnic acid, one of the products by the acetylation of methyldihydrousnic acid has been shown as being (IIa). The reaction mechanism of the dehydration reaction has been discussed to show that it involes the fission and reformation of -C-O-C- linkage in the furan nucleus and successive Dienone-Phenol rearrangement. The difference in the mode of reaction at the intermediate dehydration process would result anhydromethyldihydrousnic acid (Ia) or iso-anhydromethyldihydrousnic acid (IIa).
异
肟基甲基二
水合
萘酸的结构是甲基二
水合
萘酸乙酰化反应的产物之一,其结构式为(IIa)。脱
水反应的反应机理表明,该反应涉及
呋喃核中-C-O-C-键的裂解和重排以及随后的二烯酮-
苯酚重排。中间脱
水反应过程中的反应模式不同,将生成
肟基甲基二
水合
萘酸(Ia)或异
肟基甲基二
水合
萘酸(IIa)。