以硼酸和聚乙二醇为原料,苯为水的共沸剂,合成了一种聚乙二醇硼酸酯。考察了反应温度、反应时间、共沸剂、物料摩尔比等因素对合成工艺的影响,用热重法考察了硼酸的脱水反应,分析反应过程中可能存在的副反应,用红外光谱对聚乙二醇硼酸...以硼酸和聚乙二醇为原料,苯为水的共沸剂,合成了一种聚乙二醇硼酸酯。考察了反应温度、反应时间、共沸剂、物料摩尔比等因素对合成工艺的影响,用热重法考察了硼酸的脱水反应,分析反应过程中可能存在的副反应,用红外光谱对聚乙二醇硼酸酯进行结构表征。最佳反应条件为:反应温度130℃,反应时间60 m in,n(PEG)∶n(硼酸)=3∶1,共沸剂V(苯)/V(水)=1.25,硼酸的酯化率可达98.89%。聚乙二醇硼酸酯在工作电解液中添加质量分数为5%时,可提高闪火电压近65 V。展开更多
A method for the efficient and reliable synthesis of aryl nitriles via the Cu20-catalyed cross-coupling of aryl boronic acids or esters and TMSCN is presented. A broad range of substrates decorated by electron-rich an...A method for the efficient and reliable synthesis of aryl nitriles via the Cu20-catalyed cross-coupling of aryl boronic acids or esters and TMSCN is presented. A broad range of substrates decorated by electron-rich and defi- cient, sterically very congested, and labile functionalities were tolerated. Moreover, the reaction can proceed under mild conditions at room temperature. These advantages paired with the use of cheap, readily available, and halo- gen-free Cu20 as catalysts make the protocol an appealing option for aryl cyanations.展开更多
文摘以硼酸和聚乙二醇为原料,苯为水的共沸剂,合成了一种聚乙二醇硼酸酯。考察了反应温度、反应时间、共沸剂、物料摩尔比等因素对合成工艺的影响,用热重法考察了硼酸的脱水反应,分析反应过程中可能存在的副反应,用红外光谱对聚乙二醇硼酸酯进行结构表征。最佳反应条件为:反应温度130℃,反应时间60 m in,n(PEG)∶n(硼酸)=3∶1,共沸剂V(苯)/V(水)=1.25,硼酸的酯化率可达98.89%。聚乙二醇硼酸酯在工作电解液中添加质量分数为5%时,可提高闪火电压近65 V。
文摘A method for the efficient and reliable synthesis of aryl nitriles via the Cu20-catalyed cross-coupling of aryl boronic acids or esters and TMSCN is presented. A broad range of substrates decorated by electron-rich and defi- cient, sterically very congested, and labile functionalities were tolerated. Moreover, the reaction can proceed under mild conditions at room temperature. These advantages paired with the use of cheap, readily available, and halo- gen-free Cu20 as catalysts make the protocol an appealing option for aryl cyanations.
