排序方式: 共有45条查询结果,搜索用时 15 毫秒
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镁钴铝类水滑石催化合成安息香甲醚 总被引:1,自引:0,他引:1
采用共沉淀法制备了镁钴铝类水滑石化合物(MgCoAl-HTLcs),并用 X 射线衍射、扫描电子显微镜、NH_3程序升温脱附等方法对 MgCoAl-HTLcs 进行了表征,并以 MgCoAl-HTLcs 为催化剂催化苯甲醛与甲醇反应合成安息香甲醚,研究了n(Mg):n(Co):n(Al)、催化剂用量、原料配比、反应温度、反应时间对合成反应的影响。表征结果显示,MgCoAl-HTLcs 的晶相完整,表面主要为弱酸、弱碱性。催化合成安息香甲醚的适宜条件为:MgCoAl-HTLcs 催化剂用量0.10 g(约为原料总质量的0.23%),n(Mg):n(Co):n(Al)=0.4:1.6:1.0,V(苯甲醛):V(甲醇)=3:50,反应温度50℃,反应时间150 min。在此条件下,苯甲醛的平衡转化率达77.49%,安息香甲醚选择性接近100%。为洁净合成安息香甲醚开辟了一条新的途径。 相似文献
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以VB1为催化剂,加入辅助剂PEG-6000,顺利合成了安息香,结果表明:安息香产率高,实验重现性好,成功率达100%。 相似文献
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研究了两种探针化合物在安息香醚引发烯类单体光聚合反应中的应用,发现在光聚合反应中,不同的探针化合物有着不同的光谱响应特征和溶致变色行为,显然,这对探针的灵敏度会带来影响。实验结果表明:探针化合物在光聚合反应中能否应用,其光照稳定性起着关键作用,本工作推荐了一种适宜在烯类单体光聚合反应中应用的探针化合物。 相似文献
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Acyl phosphonates have been utilized as new acyl donors for cyanide‐catalyzed benzoin‐type reactions. Cyanation of acyl phosphonates, followed by a [1,2]‐phosphoryl migration generates the active acyl anion intermediate. The presumed (cyano)phosphate anion reacts with a variety of aryl aldehydes to yield phosphate ester‐protected, unsymmetrical benzoins in good to excellent yields. The unsymmetrical benzoin product can be obtained after deprotection of the phosphate ester with an aqueous amine solution. 相似文献
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苯偶姻氧化反应的研究 总被引:3,自引:1,他引:2
三溴化苯基三甲铵和N-溴代丁二酰亚胺与苯偶姻反应,得到氧化产物苯偶酰.提出了反应机理.证实了三溴化苯基三甲铵和N-溴代丁二酰亚胺,在苯偶姻氧化反应中,反应条件温和,产率高,是实用的由苯偶姻制备苯偶酰的途径. 相似文献
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Ni(HCO3)2 with unique phase and high crystallinity was synthesized with urea hydrolysis. The as-prepared samples were well characterized in detail. N2 adsorption and desorption result manifests a high surface area of 99.03 m2/g with a pore size of 7.8 nm. Scanning electron microscopy (SEM) and particle size distribution reveal that the diameters of the formed pellets are uniform. Thermogravimetry (TG) analysis result shows that 500 °C could be the appropriate temperature for converting Ni(HCO3)2 precursors into NiO via a thermal decomposition process. CO2 and NH3 temperature-programmed desorption results show that Ni(HCO3)2 has explicit acid-base sites. Transmission electron microscopy (TEM) results vividly indicate that the pellets are aggregated by hexagonal platelets and possess porous structures. Ni(HCO3)2 can efficiently catalyze the one-step synthesis of benzoin ethyl ether from benzaldehyde and ethanol, with the conversion of benzaldehyde up to 57.5% and nearly 100% selectivity of benzoin ethyl ether. 相似文献
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