Combined Effects on Selectivity in Fe-Catalyzed Methylene Oxidation
作者:Mark S. Chen、M. Christina White
DOI:10.1126/science.1183602
日期:2010.1.29
in organic molecules. Methylene C–H bonds are among the most difficult chemical bonds to selectively functionalize because of their abundance in organicstructures and inertness to most chemical reagents. Their selective oxidations in biosynthetic pathways underscore the power of such reactions for streamlining the synthesis of molecules with complex oxygenation patterns. We report that an iron catalyst
Reductive Electrochemical Activation of Molecular Oxygen Catalyzed by an Iron-Tungstate Oxide Capsule: Reactivity Studies Consistent with Compound I Type Oxidants
report deals with extensive reactivity studies of these Fe30W72} electrocatalytic reactions showing (1) arene hydroxylation including kineticisotope effects and migration of the ipso substituent to the adjacent carbonatom (“NIH shift”); (2) a high kineticisotopeeffect for alkyl C—H bond activation; (3) dealkylation of alkylamines and alkylsulfides; (4) desaturation reactions; (5) retention of stereochemistry
铁基酶催化的分子氧的还原活化趋向于用作氧供体是自然界中氧转移反应的典范。对这些酶和相关仿生配位化合物(几乎总是使用各种“分流”途径)旨在形成反应性中间体的机理研究表明,高价Fe(V)═O和形式上等电的Fe(IV)═O卟啉阳离子自由基通常认为中间体是烷烃和芳烃羟基化和烯烃环氧化反应中的活性物质。尽管这四年的长期研究工作已产生了大量的光谱数据,反应性研究,以及对机械机理的详尽但仍不完整的理解,分子氧的实际还原活化结合有效的催化转化很少进行实验研究。最近,我们发现了一个完全无机的氧化钨-钨胶囊,具有keplerate结构,记为Fe30 W 72 }是一种有效的电催化剂,用于水中的分子氧的阴极活化,从而导致轻质烷烃和烯烃的氧化。本报告对这些Fe 30 W 72 }电催化反应进行了广泛的反应性研究,结果表明:(1)芳烃羟基化反应,包括动力学同位素效应和ipso取代基向相邻碳原子的迁移(“ NIH
CoTPP-catalyzed reaction of saturated bicyclic endoperoxides
作者:Metin Balci、Nihat Akbulut
DOI:10.1016/s0040-4020(01)96533-0
日期:1985.1
Saturated bicyclicendoperoxides were exposed to CoTPP (Cobalt-meso-tetraphenylporphyrine) in chloroform, the peroxide bond was cleaved and a mixture of products arising from fragmentation and reduction obtained.
Bicyclic, boatlike Cope rearrangements. Probe for conformational preference by the nodal carbon atoms
作者:William Von Eggers Doering、Caroline Ann Troise
DOI:10.1021/ja00306a023
日期:1985.10
Transposition thermique des bis-(dideuteriomethylene)-1,4 cyclohexane et -cycloheptane en dimethylene-1,4 tetradeuterio-2,2,3,3 cyclohexane et -cycloheptane respectivement
Ynol Ethers as Ketene Equivalents in Rhodium-Catalyzed Intermolecular [5 + 2] Cycloaddition Reactions
作者:Paul A. Wender、Christian Ebner、Brandon D. Fennell、Fuyuhiko Inagaki、Birte Schröder
DOI:10.1021/acs.orglett.7b02765
日期:2017.11.3
electron-rich alkynes (ynol ethers) have been found to provide a highly efficient, direct route to dioxygenated seven-membered rings, a common feature of numerous natural and non-natural targets and building blocks for synthesis. The reactions proceed in high yield at roomtemperature and tolerate a broad range of functionalities. Substituted VCPs were found to react with high regioselectivity.