12‐Tungstophosphoric acid supported on aerosil silica and silica‐coated γ‐Fe2O3 nanoparticles was prepared and characterized using transmission electron microscopy,scanning electron microscopy,and inductively coup...12‐Tungstophosphoric acid supported on aerosil silica and silica‐coated γ‐Fe2O3 nanoparticles was prepared and characterized using transmission electron microscopy,scanning electron microscopy,and inductively coupled plasma atomic emission spectroscopy.The catalytic activity of the two prepared catalysts was compared in the synthesis of 1,8‐dioxo‐9,10‐diaryldecahydroacridines in water.12‐Tungstophosphoric acid was highly dispersed on the silica‐coated γ‐Fe2O3 nanoparticles and showed higher activity and a higher reuse number compared with the acid supported on aerosil silica.The catalyst could be recovered simply by using an external magnetic field and could be reused several times without appreciable loss of its catalytic activity.展开更多
选定了4种离子交换树脂型催化剂(Amberlyst15,Dowex50Wx2,Nafion NR 50,Aquivion PW79S)进行了三丁酸甘油酯合成反应。考察了反应温度、丁酸/甘油摩尔比、催化剂用量等因素对甘油转化率和三丁酸甘油酯选择性的影响。得到最佳反应条件为...选定了4种离子交换树脂型催化剂(Amberlyst15,Dowex50Wx2,Nafion NR 50,Aquivion PW79S)进行了三丁酸甘油酯合成反应。考察了反应温度、丁酸/甘油摩尔比、催化剂用量等因素对甘油转化率和三丁酸甘油酯选择性的影响。得到最佳反应条件为:反应温度140℃,丁酸/甘油摩尔比5∶1,m催化剂∶m原料=5%。在此工艺条件下,Aquivion具有很高的甘油转化率(99.5%)和三丁酸甘油酯选择性(98.7%)。由于Aquivion催化剂在水中会发生明显的溶胀现象,经过3次再生后,活性下降明显。展开更多
Aroyl isothiocyanate is synthesized by the reaction of aroyl chloride with ammoniurrthiocyanate under the condition of solid1iquid phase transfer catalysis using PEG-400 as the catalyst.The tater needs not to be isola...Aroyl isothiocyanate is synthesized by the reaction of aroyl chloride with ammoniurrthiocyanate under the condition of solid1iquid phase transfer catalysis using PEG-400 as the catalyst.The tater needs not to be isolated and is reacted with aromatic amine immediately to give N-aroy 1-N′-aryl thiourea derivatives in high yield.The promoting effects of the title compounds on wheat growth are tested preliminily.展开更多
Tri-butyl citrate(TBC) is synthesized by using several kinds of ionic liquids as catalyst.The results show that the functionalized Brnsted acid ionic liquid([TEA-PS]) is the best catalytic among them;and use it as c...Tri-butyl citrate(TBC) is synthesized by using several kinds of ionic liquids as catalyst.The results show that the functionalized Brnsted acid ionic liquid([TEA-PS]) is the best catalytic among them;and use it as catalyst to optimize the reaction conditions:the proportion of reaction materiel is 1∶3.8(citric acid∶1-butanol);reaction temperature is 130℃;reaction time is 3.5h;cat./citric acid=15∶100(wt);the conversion of citric acid up to 99%.After simply separated from the products and treated with diethyl ether,the ionic liquid could be reused 8 times without noticeably decreasing in the catalytic activity.Therefore,an environmental friendly approach for synthesis of TBC could be provided with the ionic liquid as catalysts.展开更多
基金supported by Razi University Research Council and Iran National Science Foundation
文摘12‐Tungstophosphoric acid supported on aerosil silica and silica‐coated γ‐Fe2O3 nanoparticles was prepared and characterized using transmission electron microscopy,scanning electron microscopy,and inductively coupled plasma atomic emission spectroscopy.The catalytic activity of the two prepared catalysts was compared in the synthesis of 1,8‐dioxo‐9,10‐diaryldecahydroacridines in water.12‐Tungstophosphoric acid was highly dispersed on the silica‐coated γ‐Fe2O3 nanoparticles and showed higher activity and a higher reuse number compared with the acid supported on aerosil silica.The catalyst could be recovered simply by using an external magnetic field and could be reused several times without appreciable loss of its catalytic activity.
文摘选定了4种离子交换树脂型催化剂(Amberlyst15,Dowex50Wx2,Nafion NR 50,Aquivion PW79S)进行了三丁酸甘油酯合成反应。考察了反应温度、丁酸/甘油摩尔比、催化剂用量等因素对甘油转化率和三丁酸甘油酯选择性的影响。得到最佳反应条件为:反应温度140℃,丁酸/甘油摩尔比5∶1,m催化剂∶m原料=5%。在此工艺条件下,Aquivion具有很高的甘油转化率(99.5%)和三丁酸甘油酯选择性(98.7%)。由于Aquivion催化剂在水中会发生明显的溶胀现象,经过3次再生后,活性下降明显。
文摘Aroyl isothiocyanate is synthesized by the reaction of aroyl chloride with ammoniurrthiocyanate under the condition of solid1iquid phase transfer catalysis using PEG-400 as the catalyst.The tater needs not to be isolated and is reacted with aromatic amine immediately to give N-aroy 1-N′-aryl thiourea derivatives in high yield.The promoting effects of the title compounds on wheat growth are tested preliminily.
文摘Tri-butyl citrate(TBC) is synthesized by using several kinds of ionic liquids as catalyst.The results show that the functionalized Brnsted acid ionic liquid([TEA-PS]) is the best catalytic among them;and use it as catalyst to optimize the reaction conditions:the proportion of reaction materiel is 1∶3.8(citric acid∶1-butanol);reaction temperature is 130℃;reaction time is 3.5h;cat./citric acid=15∶100(wt);the conversion of citric acid up to 99%.After simply separated from the products and treated with diethyl ether,the ionic liquid could be reused 8 times without noticeably decreasing in the catalytic activity.Therefore,an environmental friendly approach for synthesis of TBC could be provided with the ionic liquid as catalysts.
