Laser Flash Photolysis Studies on the First Superoxide Thermal Source. First Direct Measurements of the Rates of Solvent-Assisted 1,2-Hydrogen Atom Shifts and a Proposed New Mechanism for This Unusual Rearrangement<sup>1</sup>
作者:Klara G. Konya、Thomas Paul、Shuqiong Lin、Janusz Lusztyk、K. U. Ingold
DOI:10.1021/ja993570b
日期:2000.8.1
A water-assisted 1,2-H shift converting benzyloxyl into the benzyl ketyl radical is an important step in the above reaction cascade. The kinetics of the 1,2-H shift assisted by H2O, D2O, and a number of nucleophilic alcohols have been measured for the first time. These data have led to a proposed new mechanism involving the initial formation of a ketyl radical anion and an oxonium cation w...
双(4-羧基苄基)次亚硝酸盐 (SOTS-1) 在生理条件下在充气水中的热分解先前已被证明以 40 mol% 的产率产生超氧自由基阴离子(Ingold, KU; et al. J. Am . Chem. Soc. 1997, 119, 12364)。通过激光闪光光解确定了从最初形成的水溶性苄氧基自由基到超氧化物的级联事件中涉及的基本反应的绝对动力学。根据这些动力学得出的结论是,SOTS-1 将适用于在大多数生物系统中研究超氧化物诱导的氧化应激。将苄氧基转化为苄基羰基自由基的水辅助 1,2-H 转变是上述反应级联中的重要步骤。由 H2O、D2O、并且首次测量了许多亲核醇。这些数据导致提出了一种新的机制,包括最初形成羰基自由基阴离子和氧鎓阳离子...
New syntheses of mixed peroxides under Gif–Barton oxidation of alkylbenzenes, conjugated alkenes and alkanes; a free-radical mechanism
peroxides are performed under Gif oxidation of alkylaromatics, electron-rich conjugated alkenes (styrene, α-methylstyrene) or cyclohexane and acrylonitrile; chemical and kinetic evidence support a free-radical redox chain mechanism.
New general syntheses, based on free-radical oxidative alkylation, acylation and arylation of acrylonitrile, in the presence of ButO2H, are reported; the concept of the peroxy group as a pseudohalide is suggested to explain these new reactions.
Cosmetic Use of a Particular Copolymer as Skin Tensor in a Cosmetic Composition
申请人:Cassin Guillaume
公开号:US20080233077A1
公开(公告)日:2008-09-25
The present invention relates to the cosmetic use, as a skin-tensioning agent in a cosmetic composition, of a copolymer comprising units derived from styrene and units derived from ethyl (meth)acrylate, in which the weight ratio between the units derived from styrene and the units derived from ethyl (meth)acrylate is greater than or equal to 1.
OIL-IN-WATER EMULSION COMPRISING AN AMPHIPHILIC POLYMER
申请人:Simonnet Jean-Thierry
公开号:US20110110989A1
公开(公告)日:2011-05-12
The present patent application relates to a composition for topical application in the form of an oil-in-water emulsion comprising an oily phase dispersed in an aqueous phase, characterized in that it comprises at least one noncrosslinked amphiphilic polymer, the globules of the said emulsion exhibiting a mean size ranging from 15 to 500 microns and the oily phase being present in an amount of less than 35% by weight, with respect to the total weight of the composition.