Thermal decomposition of O-benzyl ketoximes; role of reverse radical disproportionation
作者:Jessie A. Blake、Keith U. Ingold、Shuqiong Lin、Peter Mulder、Derek A. Pratt、Brad Sheeller、John C. Walton
DOI:10.1039/b313491a
日期:——
9,10-dihydrophenanthrene and 9,10-dihydroanthracene than in tetralin. These results indicated that a reverse radical disproportionation reaction in which a hydrogen atom was transferred from the solvent to the oxime ether, followed by [small beta]-scission of the resultant aminoalkyl radical, must be important in the latter two solvents. Benzaldehyde was found to be an additional product from thermolyses
Photocatalyzed Triplet Sensitization of Oximes Using Visible Light Provides a Route to Nonclassical Beckmann Rearrangement Products
作者:Xiao Zhang、Tomislav Rovis
DOI:10.1021/jacs.1c10148
日期:2021.12.22
photoisomerization of oximes via visible-light-mediated energy transfer (EnT) catalysis. Facile access to (Z)-oximes provides opportunities to achieve regio- and chemoselectivity complementary to those of widely used transformations employing oxime starting materials. We show an enhanced one-pot protocol for photocatalyzed oxime isomerization and subsequent Beckmannrearrangement that enables novel reactivity with
efficient, reusable and stable binaphthyl stabilized Pd‐nanoparticles (Pd‐BNP) catalyzed the direct ortho‐C−H hydroxylation of acetophenone oxime ethers under neutral and phosphineligand‐free condition has been developed. A readily available, economic, safe and greener oxidant oxone has been used in this direct ortho‐hydroxylation. The scope of the reaction has been studied with various acetophenone oxime
Molecular Rearrangements. XXIX. Thermolysis of Aromatic Ketoximes
作者:M. Z. A. Badr、M. M. Aly、S. A. Mahgoub、A. M. Fahmy、A. A. Atallah
DOI:10.1246/bcsj.61.1779
日期:1988.5
benzophenone and/or acetophenone O-benzyloximes give pyrolysis products of the same nature in addition to others corresponding to the benzyl moiety. Thermolysis of deoxybenzoin oxime gives NH3, toluene, benzonitrile, bibenzyl, benzil, benzyl alcohol, and 2-phenylindole. Moreover, its O-benzoyl ether affords in addition to these products, benzoic acid and benzyl benzoate. The main feature of these pyrolyses
Photosensitized Reactions of Oxime Ethers: A Steady-State and Laser Flash Photolysis Study
作者:H. J. Peter de Lijser、Chao-Kuan Tsai
DOI:10.1021/jo049941a
日期:2004.4.1
The mechanistic aspects of the photosensitized reactions of a series of oxime ethers were studied by steady-state (product studies) and laser flashphotolysis methods. Nanosecond laser flashphotolysisstudies have shown that chloranil-sensitized reactions of the oxime ethers result in the formation of the corresponding radical cations. The radical cation species react with nucleophiles such as MeOH
通过稳态(产物研究)和激光闪光光解方法研究了一系列肟醚的光敏反应的机理。纳秒激光闪光光解研究表明,肟醚的苯甲酰敏化反应导致形成相应的自由基阳离子。自由基阳离子通过干净的二级动力学与亲核试剂(例如MeOH)反应,速率常数为(0.7-1.4)×10 6 M - 1 s - 1。在这些反应中仅观察到很小的空间效应,这表明反应中心不是O。-烷基部分,而是分子中的其他位置。在极性非亲核溶剂(MeCN)中进行的产品研究表明,为了使肟醚自由基阳离子更容易反应,烷基上必须有α质子。的Ô -甲基(1),Ô -乙基(2),和ø -苄基(3)苯乙酮肟全部反应容易地得到苯乙酮肟,为主要产物(以及从所述衍生的醛ø -烷基),而ø -叔丁基苯乙酮肟(4) 没有。可以通过一种机制解释产物的形成,该机制涉及电子转移,然后是质子转移(α到氧)和随后的β裂解。当在MeOH中使用3时,观察到产物形成的变化,最重要的区别是作为主