MnO<sub>2</sub> as a terminal oxidant in Wacker oxidation of homoallyl alcohols and terminal olefins
作者:Rodney A. Fernandes、Gujjula V. Ramakrishna、Venkati Bethi
DOI:10.1039/d0ob01344g
日期:——
PdCl2/CrO3/HCl produced α,β-unsaturated ketonesfrom homoallyl alcohols, the present method provided orthogonally the β-hydroxy-methyl ketones. No overoxidation or elimination of benzylic and/or β-hydroxy groups was observed. The method could be extended to the oxidation of simple terminalolefins as well, to methyl ketones, displaying its versatility. An application to the regioselective synthesis of gingerol is
Efficient Palladium(0) supported on reduced graphene oxide for selective oxidation of olefins using graphene oxide as a ‘solid weak acid’
作者:Xi Gao、Jianhao Zhou、Xinhua Peng
DOI:10.1016/j.catcom.2019.01.020
日期:2019.3
Selective oxidation of olefin derivatives to ketones has made innovative development over palladium(0) supported on reduced graphene oxide. Compared to traditional Wacker oxidation, the novel method offers an economical and environment-friendly option by using graphene oxide (GO) as a ‘solid weak acid’ instead of classical homogeneous catalysts like H2SO4 and CF3COOH. X-ray diffraction, X-ray photoelectron
烯烃衍生物选择性氧化为酮的方法已在还原性氧化石墨烯上负载的钯(0)上取得了创新性的发展。与传统的Wacker氧化相比,该新方法通过使用氧化石墨烯(GO)作为“固体弱酸”,而不是像H 2 SO 4和CF 3 COOH这样的经典均相催化剂,提供了一种经济且环保的选择。Pd 0 / RGO的X射线衍射,X射线光电子能谱,扫描电子显微镜和透射电子显微镜图像表明,在还原的氧化石墨烯的薄片结构上产生了纳米级的Pd颗粒。在最佳条件下,最多可以制备44种结构不同的酮,并具有优异的收率。
Oxidative trifluoromethylation and fluoroolefination of unactivated olefins
作者:Ye-bin Wu、Guo-ping Lu、Tao Yuan、Zhu-bing Xu、Li Wan、Chun Cai
DOI:10.1039/c6cc08178a
日期:——
The fluorine-containing organic compounds are becoming privileged in medicinal chemistry. Described herein is a mild and efficient method for the radical addition of olefins with TMSCF3 and TMSCF2R (R=COOEt or...
Mild and Regioselective Three‐component Heteroarylation‐Nitration of Alkenes with Imidazo[1,2‐
<i>a</i>
]pyridines and
<i>tert</i>
‐Butyl Nitrite
作者:Jie Zhang、Shentong Xie、Ping Liu、Peipei Sun
DOI:10.1002/adsc.202000078
日期:2020.5.26
An efficient and regioselective three‐component heteroarylation‐nitration of alkenes with imidazo[1,2‐a ]pyridines and tert ‐butyl nitrite has been developed. The process tolerants a variety of functional groups under mild conditions in the absence of catalysts and additives to give nitro functionalized imidazo[1,2‐a ]pyridine derivatives in moderate to good yields. The reaction is also applicable
已经开发了一种高效的区域选择性烯烃三元杂芳基硝化硝化反应,该硝化反应包括咪唑并[1,2- a ]吡啶和亚硝酸叔丁酯。在没有催化剂和添加剂的条件下,该工艺可在温和条件下耐受各种官能团,从而以中等至良好的收率得到硝基官能化的咪唑并[1,2- a ]吡啶衍生物。该反应也适用于其他一些氮杂杂环。
The photochemical reaction of cerium(IV) ammonium nitrate with alkenes. Rate and mechanism for the addition of the nitrate radical to alkenes
作者:E. Baciocchi、T. Del Giacco、S.M. Murgia、G.V. Sebastiani
DOI:10.1016/s0040-4020(01)90103-6
日期:1988.1
photochemical reaction of cerium(IV) ammonium nitrate (CAN) in acetonitrile with cyclohexene, 1-octene and a series of styrene derivatives leads to the formation of 1,2-dinitrate adducts in high yields. The reaction takes place by the intermediacy of the nitrate radical which forms in the photolysis of CAN. The reaction rate of NO3· with the olefinic substrates has been determined by the laser flash photolysis
硝酸铈(IV)铵化铵(CAN)在乙腈中与环己烯,1-辛烯和一系列苯乙烯衍生物的光化学反应可高产率地形成1,2-癸酸酯加合物。该反应通过在CAN的光解中形成的硝酸根自由基的中间发生。NO 3 ·与烯烃底物的反应速率已经通过激光闪光光解技术确定。观察到较高的反应性值,二阶速率常数范围为5×10 8到9×10 9 M -1 s -1。取代苯乙烯的速率数据相对于XXX +值的曲线是线性的,并且提供的-XXX值为-0.97。还发现动力学数据符合电子转移过程的Rehm-Weller方程,因此表明电子从底物转移到攻击基团是电子反应的第一步(和决定速率)。带有NO 3的苯乙烯衍生物·这一观察结果也支持了这一建议-β-甲基苯乙烯比α-甲基苯乙烯更具反应性,这与前一种底物的易氧化性以及在自由基添加中所观察到的相反。1-辛烯和环己烯的动力学数据不符合Rehm-Weller图,并且不确定这些底物与硝酸根自由基反应的机理。