中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
5-甲氧基-2-甲基苯甲酸 | 5-methoxy-o-toluic acid | 3168-59-0 | C9H10O3 | 166.177 |
The product obtained from the condensation of 5-hydroxy-2-methylbenzoic acid with aqueous formaldehyde and hydrochloric acid is dependent on the temperature. If the condensation is carried out at room temperature 3-hydroxy-6-methylphthalide results. This substance can also be obtained by the demethylation of 3-methoxy-6-methylphthalide. If the condensation is carried out at the boiling point the lactone of 8-hydroxymethyl-1,3-benzodioxane-6-methyl-7-carboxylic acid results. Proof of the presence of the m-dioxane and phthalide rings in this latter substance has been established by opening these rings in succession. In both cases this has led by a series of degradative steps to 4-methoxybenzene-1,2,3,5-tetracarboxylic acid. The structure of this acid has been confirmed by its synthesis in six unambiguous steps from mesitylene.