以水杨酸和乙酸酐为原料,固体氢氧化钠为催化剂,采用超声辐射快速合成阿司匹林,用正交实验筛选出最佳合成条件为:n(水杨酸)∶n(乙酸酐)=1∶2.5,超声辐射功率160 W,催化剂用量为水杨酸质量的10%,反应温度40℃,辐射时间8 m in,产率93.0%...以水杨酸和乙酸酐为原料,固体氢氧化钠为催化剂,采用超声辐射快速合成阿司匹林,用正交实验筛选出最佳合成条件为:n(水杨酸)∶n(乙酸酐)=1∶2.5,超声辐射功率160 W,催化剂用量为水杨酸质量的10%,反应温度40℃,辐射时间8 m in,产率93.0%。研究表明该法具有操作简单、快速、后处理简单、产率高的特点,符合清洁生产的要求。展开更多
D-Isoascorbyl stearate(D-IAS)was synthesized by the transesterification of D-isoascorbic acid and methyl stearate using concentrated sulfuric acid as reaction medium and catalyst in 73% yield.D-IAS is characterized by...D-Isoascorbyl stearate(D-IAS)was synthesized by the transesterification of D-isoascorbic acid and methyl stearate using concentrated sulfuric acid as reaction medium and catalyst in 73% yield.D-IAS is characterized by FT-IR.The iodimetry test shows the solubility of D-IAS in vegetable oil such as tea seed oil,peanut oil,rape oil and sesame oil is much greater than D-isoascorbic acid,and the antioxidation tests by GB/T5009.37-1996 shows that D-IAS is a good antioxidant with good solubility in oil.展开更多
文摘以水杨酸和乙酸酐为原料,固体氢氧化钠为催化剂,采用超声辐射快速合成阿司匹林,用正交实验筛选出最佳合成条件为:n(水杨酸)∶n(乙酸酐)=1∶2.5,超声辐射功率160 W,催化剂用量为水杨酸质量的10%,反应温度40℃,辐射时间8 m in,产率93.0%。研究表明该法具有操作简单、快速、后处理简单、产率高的特点,符合清洁生产的要求。
文摘D-Isoascorbyl stearate(D-IAS)was synthesized by the transesterification of D-isoascorbic acid and methyl stearate using concentrated sulfuric acid as reaction medium and catalyst in 73% yield.D-IAS is characterized by FT-IR.The iodimetry test shows the solubility of D-IAS in vegetable oil such as tea seed oil,peanut oil,rape oil and sesame oil is much greater than D-isoascorbic acid,and the antioxidation tests by GB/T5009.37-1996 shows that D-IAS is a good antioxidant with good solubility in oil.
