hydrogen bonding and halogen bonding in the formation of supramolecularpolymers is explored. In particular, the cocrystallization of 1-bromo-2,3,5,6-tetrafluorobenzene, or 1,2,4,5-tetrafluoro-3-iodobenzene, with each of the dipyridyls 4,4′-bipyridine, trans-1,2-bis(4-pyridyl)ethene, and 1,2-bis(4-pyridyl)ethyne results in the formation of linear supramolecularpolymers in which the two components are held
Transition-Metal-Free Decarboxylative Iodination: New Routes for Decarboxylative Oxidative Cross-Couplings
作者:Gregory J. P. Perry、Jacob M. Quibell、Adyasha Panigrahi、Igor Larrosa
DOI:10.1021/jacs.7b05155
日期:2017.8.23
its application to oxidative cross-couplings of aromatics via decarboxylative/C–H or double decarboxylative activations that use I2 as the terminal oxidant. This strategy allows the preparation of biaryls previously inaccessible via decarboxylative methods and holds other advantages over existing decarboxylative oxidative couplings, as stoichiometric transition metals are avoided.
19F and 1H NMR and ESR investigations of aryl-t-butyl nitroxides and nitronylnitroxides
作者:J. Goldman、T.E. Petersen、K. Torssell、J. Becher
DOI:10.1016/0040-4020(73)80203-0
日期:1973.1
1H and 19F NMR and ESR spectra of several nitroxides have been recorded. The 19F couplings are sensitive to steric factors and this shows why the simple linear relationship aF = OeffF· ϱCπ is not adequate. The π and σ spin delocalization mechanisms are demonstrated. The spin transmission via oxygen and sulphur is affected by geometry (efficiency of pπ-nπ overlap), pπ-dπ overlap only plays a role in
已经记录了几种氮氧化物的1 H和19 F NMR和ESR光谱。在19个˚F联轴器是位阻因素敏感,这说明了为什么简单的线性关系的˚F = O EFF ˚F ·ρ Ç π是不够的。证明了π和σ自旋离域机制。通过氧和硫的自旋传输受几何形状(pπ-nπ重叠的效率)的影响,pπ-dπ重叠仅在带正电的S原子(砜)中起作用。烷基链中质子偶联的绝对符号取决于链长和取代基。描述了几种稳定的氮氧化物的合成。
Method for producing tetrakis ( fluoroaryl) borate-magnesium compound
申请人:——
公开号:US20030216598A1
公开(公告)日:2003-11-20
Fluoroaryl magnesium halide is reacted with a boron compound so that a molar ratio of the fluoroaryl magnesium halide to the boron compound is not less than 3.0 and not more than 3.7, so as to produce a tetrakis (fluoroaryl) borate·magnesium compound. With this method, there occurs no hydrogen fluoride which corrodes a producing apparatus and requires troublesome waste water treatment.
Reactions of polyfluoroaromatic compounds with electrophilic agents in the presence of tris(dialkylamino)phosphine
作者:V. V. Bardin
DOI:10.1007/bf02495213
日期:1997.4
The rate of replacement of the halogen atom in isomers of RC6F4X (X=Cl, Br, or I) by the SiMe3 group under the action of Me3SiCl and P(NEt2)3 depends on the nature and the mutural arrangement of the substituents X and R. In addition to silyldehalogenation, compounds C6HF4X (X=Br or I) undergo silyldeprotonation and reduction to tetrafluorobenzenes.