在 H3PO4 存在下进行了 2 ,3-二甲基 - 2 -丁烯与乙酐的酰化反应 .结果表明 ,H3PO4 是室温下催化 2 ,3-二甲基 - 2 -丁烯与乙酐酰化反应的有效催化剂 .在 H3PO4 存在下 ,酰化产物的收率主要取决于 :(a) H3PO4 的用量 ,(b)乙酐的用量 ,(c)反应温度和 (d)反应时间 .在适宜反应条件下 ,所得 3,3,4 -三甲基 - 4 -戊烯 - 2 -酮 (TMP)约为99% .另外还发现 ,反应体系中加入少量乙酸 ,不会明显减少酰化产物的收率 .乙酐的纯度、反应物的加入顺序对该反应几乎没有任何影响 .在有和没有溶剂 CH2 Cl2 的条件下所得酰化产物的收率是可比的 . The acylation of 2,3-dimethyl-2-butene with acetic anhydride was carried out in the presence of H3PO4.The results showed that H3PO4 catalyzed the reaction of 2,3-dimethyl-2-butene with acetic anhydride at room temperature Effective catalyst for the reaction of the reaction The yield of acylated product in the presence of H3PO4 depends mainly on: (a) the amount of H3PO4, (b) the amount of acetic anhydride, (c) the reaction temperature and (d) the reaction time, Under the reaction conditions, the obtained 3,3,4 - trimethyl - 4 - pentene - 2 - ketone (TMP) was about 99% .It was also found that adding a small amount of acetic acid to the reaction system did not significantly reduce the Yield The purity of the acetic anhydride, the order of addition of the reactants, has virtually no effect on the reaction.The yield of the acylated product obtained is comparable with and without the solvent CH2 Cl2.