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以邻硝基氯苯在相转移催化剂作用下O-甲基化反应为例,在一定条件下探讨了相转移催化机理及动力学方程 相似文献
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并有天然母体杂环的吡啶酮衍生物的合成 总被引:1,自引:0,他引:1
以异苯并二氢吡喃酮-4为起始原料,在氢氧化钠的醇水溶液中与芳醛进行ALDOL缩合得到异色满酮-4的α、β不饱和衍生物(2a-c),在含有乙醇钠的乙醇中将上述化合物分别与氰乙酰胺发生迈克尔加成得到收率为83%~90%的标题物(4a-c).在哌啶催化下用类似的方法处理异色满酮-4的α、β不饱和衍生物制得3、4二氢异苯并吡喃并吡啶酮,将二氢吡啶酮以单质硒脱氢相应地也生成标题物(4a-c).所得衍生物经元素分析、红外光谱分析及核磁共振分析证实其化学结构. 相似文献
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研究了顺丁烯酸酐和甲醇在1-甲基-3-烷基咪唑/AlCl3催化使用下,经异构化和酯化反应合成反丁烯二酸二甲酯化合物,用统计序贯实验设计方法对合成过程进行了优化。开发了一条产品收率高,与盐酸,三氯化钕等催化工艺相比具有无腐蚀、无污染,价廉等优点的制备工艺,实验结果表明,1-甲基-3-烷基咪唑/AlCl3催化剂具有异构化和酯化两种催化作用,省去了以顺丁烯二酸酐为原料先制备富马酸中间产品的过程,反应条件温和,操作简便,一步法即可得到产品,其纯度为99.4%,最佳工艺条件为:催化剂用量与顺丁烯二酸酐摩尔比为0.17:1,甲醇与顺丁烯二酸酐摩尔比为4.01:1,反应温度为93.0℃,反应时间为5.0小时,在实验条件下,反丁烯二酸二甲酯的收率达到90%。 相似文献
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以四丁基溴化铵为相转移催化剂,L27(3^13)正交设计。对邻硝基氯苯的甲氧基化反应进行了考察,确立了最佳的原配比和反应温度等制备条件。在最优制备条件下对催化剂的结构效应,反应历程进行了探讨。 相似文献
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离子液体介质中沥青砂内重组分降解过程 总被引:10,自引:0,他引:10
This paper illustrates the reaction pattern of catalytic degradation of macromolecules in asphaltic sands. Such parameters as ionic liquid catalyst system and H^ proton donor, that affect the change of the organic phase and the mass of organic matter in residual phase of asphaltic sands, were investigated. It was found that chloroaluminate (Ⅲ) ionic liquid/H3PO4 systems as reaction medium was an effective catalyst system for asphaltic sands degradation. The catalytic degradation of asphaltic sand swas related to the kinds of chloroaluminate (Ⅲ) ionic liquids and H^ proton donor. In [BMIM] [AlCl4]/H3PO4 reaction catalytic medium, the degradation of asphaltenes in the organic phase reached 16.44 %, the degradation of asphaltenes in the residual phase reached 30.74%. TLC-FID analysis of asphaltic sands showed that the main degradation products were saturates and aromatics, and resin fractions as well. At a temperature close to oil-bearing formation and with absense of oxygen, the yield of H2S reached 74%,which indicated that catalytic degradation of sulphur-containing compounds was easier. 相似文献