为什么NaBH4,还原戊烯酮,在加入CeCl3后,只还原羰基不还原烯键? 只看楼主收藏回复 机械故障 动力学 9 0 送TA礼物 1楼2007-07-24 19:16回复 亲核取代 无机化学 1 因为C=C键极化度不高,不容易被H-进攻 /div>2楼2007-07-24 19:24 回复 123.113.176.* NaBH4还原能力没那么强,不还原碳碳双键...
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...
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...
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, ...
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求 肉桂酸的应用: 对羟基肉桂酸 肉桂酸有毒吗 「肉桂酸肉桂酯」...
For example, the strongly chelating TiCl4led to the syn isomer while non-chelating CeCl366 gave anti isomer 67. The keto esters are also r 64、educed using the ZnCl2NaBH4system to afford the corresponding hydroxy ester (Eq. (59) 68. (59) Stereoselective reduction of 3-keto-2-methyl ...
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...
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, ...
The original article is trackable via the "References" option.doi:10.1002/chin.199749065C. LIUDep. Chem., Memorial Univ., St. John′s, Newfoundland A1B 3X7, Can.D. J. BURNELLDep. Chem., Memorial Univ., St. John′s, Newfoundland A1B 3X7, Can.John Wiley & Sons, LtdChemInform...