NaBH4/CeCl3·7H2O 2-氧-4-苯基-3丁炔酸酯 选择性还原 酯交换反应NaBH4/CeCl3·7H2O体系与2-氧-4-苯基-3丁炔酸酯发生了选择性还原反应和酯交换反应,产物的结构经IR,1H-NMR和元素分析等证实。该方法具有反应条件温和、操作简便、无毒、试剂价廉易得等优点。张永霞王景梅化工中间体...
刺来自槐甙的介绍 什么是二良素岩胞组相在乙二醇-丁醚乙酸酯 与CeCl3和NaBH4的作用相关的问答 肉桂酸和反式肉桂酸一样吗 肉桂酸甲酯的肉桂酸甲酯的合成 肉桂酸厂家? 肉桂酸实验 请问分别做肉桂酸,肉桂酸甲酯的紫外谱图时所需的肉桂酸,肉桂酸甲酯的最适标液浓度是多少呀? 肉桂酸的制备中肉桂酸的理论值怎么...
在此基础上,研究了一系列底物的还原,将NaBH4一CeCl3??7H20(c at)体系应用于脂肪族、芳香族和氨基酸甲酯的还原中,生成相应的醇。羧酸酯 在室温下搅拌24h,即能实现其还原,收率高(75%‟-一95%),且卤素、 -N02、.OCH3、.OH、一C=C.等易被还原的官能团均未受到影响, ...
If you wanted to favour reduction of the enone carbonyl, you would use the Luche Reduction (https://en.wikipedia.org/wiki/Luche_reduction), where addition of Lewis acidic CeCl3 enhances its reactivity relative to the ketone. Logged Print Pages: [1] Go Up « previous next »...
Sodium borohydride (NaBH4) can be made through the addition of sodium hydride (NaH) to our old friend borane (BH3–See post: Hydroboration-Oxidation of Alkenes) in an appropriately chosen solvent [Note 1]. We generally don’t think of the hydride ion (NaH) as being a very good nucleophil...
貌似羰基碳亲电性比beta碳要好,所以H-先进攻羰基。双键失去和羰基的共轭后亲电性再次减弱就更不能被进攻了。所以NaBH4和LiAlH4还原alpha,beta-不饱和醛酮只还原C=O双键(?) 来自iPhone客户端2楼2019-12-01 14:53 收起回复 冲咖啡的人 核化学 13 有些时候会一同还原,可以通过CeCl3等方式抑制副反应 来自iPho...
63、 ketones. (58) Metal salts mediated NaBH4reduction of a-alkyl-b- keto esters leads to different stereochemical control depending on the nature of the metal atom. For example, the strongly chelating TiCl4led to the syn isomer while non-chelating CeCl366 gave anti isomer 67. The keto este...
Phosphine oxides and LiAlH4-NaBH4-CeCl3: Synthesis and reactions of phosphine-boranes T Imamoto,T Kusumoto,N Suzuki,... - 《Journal of the American Chemical Society》 被引量: 184发表: 1985年 Chemical regeneration of hydrogen storage materials Several chemical hydrides, such as NaBH4, LiAlH4, ...
Phosphine oxides and LiAlH4-NaBH4-CeCl3: Synthesis and reactions of phosphine-boranes 步反应合成了7个(S)-2-氨基-3-(4-烷基苯基)-1-丙醇类目标化合物;以L-Boc酪氨酸甲酯为原料,进行苄基保护酚羟基,LiAlH4还原,脱保护,烷基化,脱Boc等反应... T Imamoto,T Kusumoto,N Suzuki,... - 《Journal of ...
NaBH4/CeCl3 · 7H2OreductiontransesterificationAn efficient one-pot synthesis of α -hydroxy propargylic esters by chemoselective reduction followed by transesterification using NaBH4 in combination with CeCl3·7H2O is described.doi:10.1080/00397911.2010.502993Thangavel Saravanan...