Chemistry of the tert-butyl radical: polar character, .rho. value for reaction with toluenes, and the effect of radical polarity on the ratio of benzylic hydrogen abstraction to addition to aromatic ringsintermediates (and their reactionsWe have reexamined the reactions of tert-butyl radicals with...
ChemInform Abstract: Polarity Reversal Catalysis of Radical Reactions: Hydrogen‐Atom Abstraction from Cyclopentadiene and from Cycloheptatriene 来自 Wiley 喜欢 0 阅读量: 14 作者:PAUL, V,ROBERTS, B. P,ROBINSON, C. A. S 摘要: In the absence of catalyst (cat.) both radicals (III) and (IV) ...
doi:10.1002/chem.200400685Andreas GansäuerThorsten LauterbachDaniel Geich-GimbelJohn Wiley & Sons, Ltd.ChemistryGansauer, A.; Lauterbach, T.; Geich-Gimbel, D. Polarity matching of radical trapping: High yielding 3-exo and 4-exo cyclizations. Chem. Eur. J. 2004, 10, 4983-4990....
Studies of the polarity of the tri-n-butyltin radical 喜欢 0 阅读量: 6 作者:GL Grady,TJ Danyliw,P Rabideux 摘要: A satisfactory Hammett correlation was observed for the radical reduction of substituted benzyl halides by tri-n-butyltin hydride. The magnitude of the positive ϱ value ...
摘要: Polarity-reversal catalysis by tri- tert -butoxysilanethiol has been applied to promote radical-chain epimerisation selectively at carbon centres of the type R 1 R 2 C ∗ (H)OR.关键词: epimerisation radicals and radical reactions catalysis thiols ...
aIntestinal epithelial tight junctions (TJs) are a specialized structure that determines the cell polarity and prevents the diffusion of toxins, allergens, and pathogens from the lumen into the tissue. TJs are highly dynamic and its constituent protein complexes undergo continuously remodeling and turn...
The difference in polarity between the bulk phase and the micellar phase is responsible for this behavior. This microenvironment effect modifies the reactivity ratios of those hydrophobes capable of forming hydrogen bonds, whereas the reactivity of the other hydrophobes remains unaffected. 展开 ...
value for reaction with toluenes, and the effect of radical polarity on the ratio of benzylic h... We have reexamined the reactions of tert-butyl radicals with toluenes and have obtained a 蟻 value of 0.49 卤 0.04 at 80掳C. The new, independent system in... WA Pryor,FY Tang,RH ...
P. Polarity-reversal catalysis of hydrogen-atom abstraction reactions: concepts and applications in organic chemistry. Chem. Soc. Rev. 28, 25–35 (1999). Considered the seminal study of polarity-reversal catalysis. Article CAS Google Scholar Enquist, J. A. & Stoltz, B. M. The total ...
[Characteristics of segmentation and determination of dorsoventral polarity in the development of Spiralia. I. The form of the first equal cleavage division] Alpine deformation in the Grimsel granodiorite (Aar massif, Central Alps) at greenschist facies conditions (6.5卤1kbar for 450掳C卤25掳C) ...