Water and hydroxide ion pathways in the σ-complexation of superelectrophilic 2-aryl-4,6-dinitrobenzotriazole 1-oxides in aqueous solution. A kinetic and thermodynamic study
Mayr electrophilicity predicts the dual Diels–Alder and σ-adduct formation behaviour of heteroaromatic super-electrophiles
作者:Sami Lakhdar、Régis Goumont、François Terrier、Taoufik Boubaker、Julian M. Dust、Erwin Buncel
DOI:10.1039/b702060k
日期:——
Diels-Alder (normal and inverse electron demand) reactivity of this series of heteroaromatic electrophiles and have shown that Mayr E values are valid predictors of whether DA adducts will form and how rapidly. The observed order of pericyclic reactivity corresponds to E = -8.5 as the demarcation E value, in close agreement with sigma complexation; thus pointing to a common origin for the two processes, i.e
Nucleophilicities of Para-Substituted Phenoxide Ions in Water and Correlation Analysis
作者:W. GABSI、T. BOUBAKER、R. GOUMONT
DOI:10.1002/kin.20846
日期:2014.12
benzotriazoles 1a‐d were linear, allowing to derive the nucleophilicity parameters N and s for phenoxide ions as defined by the Mayr equation log k1 (20°C) = s (E + N) (H. Mayr, M. Patz. Angew Chem, Int Ed Engl 1994, 33, 938–957). The N values are found to cover a range of nucleophilicity from 6.85 to 10.22, going from 4‐cyanophenoxide 2d for the least reactive ion to 4‐methoxyphenoxide 2a for the most reactive
2-芳基-4-6,6-二硝基苯并三唑1-氧化物1a-d与一些4-X-取代的酚盐离子2a-d(X = OCH 3,H,Cl和CN)的反应的二级速率常数为在20℃下在水溶液中测量。根据相关性E = –3.20 – 0.662 p K a(F. Terrier,S),在水中测量的一系列苯并三唑1a-d的σ络合过程的p K a值已用于确定其亲电参数E。。拉赫达尔,T. Boubaker和R. Goumont,有机化学杂志,2005,70,6242-6253)。对于这些反应,log k的图苯并三唑1a-d的亲电参数E与线性关系是线性的,因此可以得出Mayr方程log k 1(20°C)= s(E + N)(H.)定义的酚盐离子的亲核参数N和s。迈尔,M. PATZ。Angew化学,诠释埃德英格兰1994,33,938-957)。的Ñ值被发现覆盖范围亲核性从6.85到10.22,从4- cyan
Oxidation system containing a macrocyclic metal complex, the production thereof and its use
申请人:Vogt Uwe
公开号:US20060217281A1
公开(公告)日:2006-09-28
Disclosed is an oxidizing system comprising a macrocyclic metal complex, an oxidizing agent and an oxidation-enhancing compound. This oxidizing system is useful under a wide variety of reaction conditions for oxidizing oxidizable substances by contacting the oxidizable substance with the specific oxidizing system. An example of a possible use is in a process for removing excess, unfixed dye from textile materials after a dyeing.