Activated methylene compound such as dimethyl malonate reacted readily with benzylic alcohols in the presence of ferric chloride/silica gel mixture (FeCl3/SiO2) under microwave irradiation to produce benzylic deriva...Activated methylene compound such as dimethyl malonate reacted readily with benzylic alcohols in the presence of ferric chloride/silica gel mixture (FeCl3/SiO2) under microwave irradiation to produce benzylic derivative of dimethyl malonate in high yields in solvent-free condition. 2009 Mohammad Reza Shushizadeh. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.展开更多
1-chloro-octane, 1-chloro-dedocane and 1-chloro-hexadecane are synthesized from the corresponding alcohols. The reactions are catalyzed by N, N-dimethyl formamide and dodecyltrimethyl animonium chloride, not only the ...1-chloro-octane, 1-chloro-dedocane and 1-chloro-hexadecane are synthesized from the corresponding alcohols. The reactions are catalyzed by N, N-dimethyl formamide and dodecyltrimethyl animonium chloride, not only the reaction time has been reduced, but also the yield improved from 10%~20%.展开更多
利用旋转滴界面张力仪研究了不同烷基链长的支链脂肪醇聚氧乙烯醚磺酸盐异十六烷基聚氧乙烯醚磺酸盐(i-C16EO5S)、异十八烷基聚氧乙烯醚磺酸盐(i-C18EO5S)和异十二烷基聚氧乙烯醚磺酸盐(i-C20EO5S)溶液与正癸烷之间的动态界面张力,考察...利用旋转滴界面张力仪研究了不同烷基链长的支链脂肪醇聚氧乙烯醚磺酸盐异十六烷基聚氧乙烯醚磺酸盐(i-C16EO5S)、异十八烷基聚氧乙烯醚磺酸盐(i-C18EO5S)和异十二烷基聚氧乙烯醚磺酸盐(i-C20EO5S)溶液与正癸烷之间的动态界面张力,考察了表面活性剂质量分数、盐质量分数、二价离子对界面张力的影响.实验结果表明:与相同链长的直链表面活性剂相比,支链化结构有利于界面张力的降低,适宜条件下iC16EO5S的界面张力可达10-2 m N/m数量级;Na Cl可加快i-CnEO5S向界面的吸附速度,高盐质量分数条件下i-CnEO5S的动态界面张力出现最低值,曲线呈现"V"形,且瞬时界面张力可达10-3 m N/m数量级;二价离子的存在促进表面活性剂吸附膜的紧密排列,低浓度条件下有利于界面张力的降低,但二价离子浓度较高时破坏表面活性剂的亲水亲油平衡,造成界面张力稳态值明显升高.展开更多
基金Science and Research University for financial support of this work
文摘Activated methylene compound such as dimethyl malonate reacted readily with benzylic alcohols in the presence of ferric chloride/silica gel mixture (FeCl3/SiO2) under microwave irradiation to produce benzylic derivative of dimethyl malonate in high yields in solvent-free condition. 2009 Mohammad Reza Shushizadeh. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.
文摘1-chloro-octane, 1-chloro-dedocane and 1-chloro-hexadecane are synthesized from the corresponding alcohols. The reactions are catalyzed by N, N-dimethyl formamide and dodecyltrimethyl animonium chloride, not only the reaction time has been reduced, but also the yield improved from 10%~20%.
基金the National Natural Science Foundation of China(Grant No.29972018)Foundation for University Key Teacher by Ministry of Education of China for financial support.
文摘利用旋转滴界面张力仪研究了不同烷基链长的支链脂肪醇聚氧乙烯醚磺酸盐异十六烷基聚氧乙烯醚磺酸盐(i-C16EO5S)、异十八烷基聚氧乙烯醚磺酸盐(i-C18EO5S)和异十二烷基聚氧乙烯醚磺酸盐(i-C20EO5S)溶液与正癸烷之间的动态界面张力,考察了表面活性剂质量分数、盐质量分数、二价离子对界面张力的影响.实验结果表明:与相同链长的直链表面活性剂相比,支链化结构有利于界面张力的降低,适宜条件下iC16EO5S的界面张力可达10-2 m N/m数量级;Na Cl可加快i-CnEO5S向界面的吸附速度,高盐质量分数条件下i-CnEO5S的动态界面张力出现最低值,曲线呈现"V"形,且瞬时界面张力可达10-3 m N/m数量级;二价离子的存在促进表面活性剂吸附膜的紧密排列,低浓度条件下有利于界面张力的降低,但二价离子浓度较高时破坏表面活性剂的亲水亲油平衡,造成界面张力稳态值明显升高.