共查询到20条相似文献,搜索用时 15 毫秒
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通过微波辐射, 以FeCl3为催化剂进行无溶剂条件下的呐醇重排反应, 1 min产率可达86%~96%. 该方法具有操作简便、反应时间缩短、对环境友好等优点. 相似文献
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E. V. Tret'yakova O. B. Flekhter F. Z. Galin I. P. Baikova G. A. Tolstikov 《Chemistry of Natural Compounds》2003,39(1):16-18
Beckmann rearrangement of dimethylcyclopentanonepimarate-15-oxime 2 was used to produce lactam 3 or seco-nitrile 4, depending on the conditions. The structures of the synthesized compounds were confirmed by IR and NMR spectroscopies. 相似文献
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Lin Fei XIAO Jia Jian PENG Chun Gu XIA 《中国化学快报》2006,17(5):617-620
The conversion of ketoxime into corresponding amide, known as the Beckmann rearrangement, is a common method used in organic chemistry and is also a topic of current interest. It accomplishes both the cleavage of carbon-carbon bond and the formation of a carbon-nitrogen bond, and represents a powerful method particularly for manufacture ε-caprolactam in chemical industry. This reaction, however, generally requires high reaction temperature, strong Br?nsted acid and dehydrating media, causing … 相似文献
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Zheng Li Runbo Ding Zhong Lu Shuxiu Xiao Xuelin Ma 《Journal of molecular catalysis. A, Chemical》2006,250(1-2):100-103
Silica sulfate has been proved to be an efficient and recyclable catalyst for Beckmann rearrangement of a variety of oximes in acetone under microwave irradiation. This protocol has advantages of high conversion, high selectivity, short reaction time, no environmental pollution, and simple work-up procedure. 相似文献
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Jitendra Gurjar Prof. Dr. Valery V. Fokin 《Chemistry (Weinheim an der Bergstrasse, Germany)》2020,26(46):10402-10405
A metal-free and redox-neutral method for Beckmann rearrangement employing inexpensive and readily available SO2F2 gas is described. The reported transformation proceeds at ambient temperature and is compatible with a wide range of sterically and electronically diverse aromatic, heteroaromatic, aliphatic and lignin-like oximes providing amides in good to excellent yields. The reaction proceeds through the formation of an imidoyl fluoride intermediate that can also be used for the synthesis of amidines. 相似文献
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利用廉价易得的氟硼酸钴水合物, 在温和、 无添加剂的空气条件下, 高效催化酮肟衍生物的贝克曼重排反应, 底物的普适性和官能团的兼容性均较理想, 产物收率最高达97%. 基于该高活性的氟硼酸钴水合物, 实现了10 g级二苯甲酮肟的贝克曼重排反应, 收率为71%. 同时, 也实现了钴催化酮类衍生物和盐酸羟胺的一步法贝克曼重排反应, 产物最高收率为94%, 反应体系中无溶剂及添加剂, 反应体系的原子经济性和底物普适性较好. 相似文献
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钛硅分子筛催化气相环己酮肟贝克曼重排反应 总被引:4,自引:0,他引:4
对比研究了具有MFI结构的TS-1,silicalite-1,Al-ZSM-5和B-ZSM-5分子筛对气相环己酮肟贝克曼重排反应的催化性能.结果显示,TS-1适宜用作重排反应的催化剂,而含骨架B或Al的ZSM-5分子筛的催化性能较差,表明将Ti引入至sili-calite-1有利于改善其对环己酮肟重排反应的催化性能.反应氛围(溶剂、载气和原料添加物)对TS-1催化性能的影响规律说明,弱酸性气体的存在有利于TS-1对环己酮肟的活化与己内酰胺的选择性生成.优化的反应氛围包括以甲醇或乙醇为溶剂,二氧化碳为载气,以及醋酸为原料添加物. 相似文献
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《中国化学》2017,35(11):1673-1677
An efficient Beckmann rearrangement of ketoximes was developed using carbon tetrabromide/triphenylphosphine as an organocatalyst without addition of any acids or metals. The reaction showed good functional group tolerance and gave various amides in moderate to good yields. 相似文献
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Efficient Procedure for Beckmann Rearrangement of Ketoximes Catalyzed by Sulfamic Acid/Zinc Chloride
The Beckmann rearrangement of a variety of ketoximes to corresponding amides catalyzed by sulfamic acid and zinc chloride was carried out in good yields at refluxing temperature in acetonitrile. 相似文献
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Abstract Carbonyl compounds were regenerated from corresponding dithioacetals via refluxing with FeCl3/KI and methanol as a solvent. 相似文献
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微波干法催化醛酮与胺的缩合反应 总被引:2,自引:1,他引:2
利用微波辐射和固体中性Al2 O3 载体催化醛酮与胺的缩合反应的方法合成了十六种亚胺 ,研究了微波功率、作用时间、产物提取方式等因素对反应的影响 ;与无微波作用的一般合成方法相比 ,该法明显地提高反应速度及产率 ;文中用低极性熔点递变物质灌装毛细管的方法观测微波作用下反应温度 ,探讨微波作用化学反应的机理 ,其机理除与微波加热作用有关外还与分子间氢键及分子的缔合性有关。 相似文献
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微波照射制备钛酸钡纳米晶 总被引:4,自引:2,他引:2
Cubic barium titanate nanocrystals were prepared by Ti(OC4H9)4 and C2H5OH mixture with BaCl2 aqueous solution under normal atmosphere microwave irradiation. Experiment results showed that when nBa / nTi=1.1, φEtOH=25%,highly dispersed barium titanate with particle size about 30 nm were completely formed by microwave irradiation only for 0.5 h. Microwave irradiation time had almost no effects on particle size and morphology of the product. Particle sizes were decreased with the increased EtOH amount, when φEtOH=50%, microwave irradiation 2 h, barium titanate nanocrystals with average size only about 22 nm were obtained. 相似文献