نتایج جستجو برای: intermediate radical

تعداد نتایج: 219788  

Journal: :Organic letters 1999
M E Jung Y Xu

[formula: see text] Conversion of the inexpensive L-arabinose 1 into the ethylthio ortho ester 7 followed by generation of the dialkoxyalkyl radical III produces the desired 2-deoxy-L-ribose triester 4 in excellent overall yield. It has been shown that the similar dialkoxyalkyl radical IV is not an intermediate in the 1,2-acyloxy shift of anomeric radical I.

2015
Ya Lin Tnay Gim Yean Ang Shunsuke Chiba

We report herein studies on copper-catalyzed aerobic radical C-C bond cleavage of N-H ketimines. Treatment of N-H ketimines having an α-sp(3) hybridized carbon under Cu-catalyzed aerobic reaction conditions resulted in a radical fragmentation with C-C bond cleavage to give the corresponding carbonitrile and carbon radical intermediate. This radical process has been applied for the construction ...

Journal: :Free radical biology & medicine 2015
Umar T Twahir Corey N Stedwell Cory T Lee Nigel G J Richards Nicolas C Polfer Alexander Angerhofer

This contribution describes the trapping of the hydroperoxyl radical at a pH of 4 during turnover of wild-type oxalate decarboxylase and its T165V mutant using the spin-trap BMPO. Radicals were detected and identified by a combination of EPR and mass spectrometry. Superoxide, or its conjugate acid, the hydroperoxyl radical, is expected as an intermediate in the decarboxylation and oxidation rea...

Journal: :The journal of physical chemistry. A 2010
Adam W Birdsall John F Andreoni Matthew J Elrod

The products of the primary OH-initiated oxidation of toluene were investigated using the turbulent flow chemical ionization mass spectrometry technique under different oxygen, NO, and initial OH radical concentrations as well as a range of total pressures. The bicyclic peroxy radical intermediate, a key proposed intermediate species in the Master Chemical Mechanism (MCM) for the atmospheric ox...

Journal: :Biochemical Society transactions 1992
P J Harvey R Floris T Lundell J M Palmer H E Schoemaker R Wever

Lignin peroxidase (LiP) is a fungal haemoprotein similar to the lignin-synthesizing plant peroxidases, but it has a higher oxidation potential and oxidizes dimethoxylated aromatic compounds to radical cations. It catalyses the degradation of lignin models but in vitro the outcome is net lignin polymerization. LiP oxidizes veratryl alcohol to radical cations which are proposed to act by charge t...

Journal: :Physical chemistry chemical physics : PCCP 2012
Benjamin B Kirk David G Harman Hilkka I Kenttämaa Adam J Trevitt Stephen J Blanksby

The phenylperoxyl radical has long been accepted as a critical intermediate in the oxidation of benzene and an archetype for arylperoxyl radicals in combustion and atmospheric chemistry. Despite being central to many contemporary mechanisms underpinning these chemistries, reports of the direct detection or isolation of phenylperoxyl radicals are rare and there is little experimental evidence co...

2014
YI XU CHARLES A. PERFETTI

The logographic nature of the Chinese writing system creates a huge hurdle for Chinese as a foreign language (CFL) learners. Existing literature (e.g., Shen, 2010; Taft & Chung, 1999) suggests that radical knowledge facilitates character learning. In this project, we selected 48 compound characters in eight radical groups and examined how grouping characters based on their radicals affected the...

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