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烯基自由基
相关语句
  ethylenic radical
     Intramolecular Cyclization Reactions of Ethylenic Radical
     烯基自由基的分子内环化反应
短句来源
  相似匹配句对
     Intramolecular Cyclization Reactions of Ethylenic Radical
     烯基自由基的分子内环化反应
短句来源
     FREE RADICAL'S SCAVENGING
     自由基的清除
短句来源
     2 radicals.
     2 自由基活性
短句来源
     THE SOLVENT EFFECT ON RADICAL COPOLYMERIZATION OF POLY(ST-B-EO)-MA MACROMER WITH ST, MMA AND MA
     溶剂对聚(苯乙烯-环氧乙烷)嵌段大单体与某些烯基单体自由基共聚活性的影响
短句来源
     STUDY ON THE OLIFIN SULFONATES
     关于烯基磺酸盐的研究
短句来源
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Primary radicals from the γ-radiolysis of air-saturated linoleic acid and linolenic acid at 77 K, and the subsequent sccondary radicals appeared during thecourse of variable temperature elevation were investigated by ESR. The ESR spectrumfrom samples irradiated and observed at 77 K shows the presence of the radical aniondoublet arised from the electron adducts of the carboxygroups and the poorly resol-ved broad singlet results from some carbon-centered radicals. Annealing to approxi-mately 125 K which allow...

Primary radicals from the γ-radiolysis of air-saturated linoleic acid and linolenic acid at 77 K, and the subsequent sccondary radicals appeared during thecourse of variable temperature elevation were investigated by ESR. The ESR spectrumfrom samples irradiated and observed at 77 K shows the presence of the radical aniondoublet arised from the electron adducts of the carboxygroups and the poorly resol-ved broad singlet results from some carbon-centered radicals. Annealing to approxi-mately 125 K which allow for molecular oxygen migration results in the formationof peroxyl radicals. At 247 K, the ESR spectrum is a multi-line pattern which isattributable to structure of the α-carbon radical superimposed on the pentadienyl ra-dicals. The ESR spectra from linoleic acid-----α-tocopherol and linolenic acid----α-tocopherol binary systems irradiated at 77 K and recorded at 140 K or 215 K revealedhe characteristic similarity to that from α-tocopherol alone, no trace of ESR signalfrom either peroxyl or t composite pattern from superposition of pentadienyl radical and α-carbon radicals can be found out. Therefore α-tocopherol has exerted ra-dioprotection effect on peroxidation of linoleic acid and linolenic acid.

用电子自旋共振波谱法,对在含氧条件下经过低温γ辐照的不饱和脂质亚油酸和亚麻酸产生的初级不稳定自由基,及其在程序升温过程中所产生的自由基变化进行了研究。由77K辐照并测定的ESR谱表明其初级不稳定产物为阴离子自由基和脂质长链上不饱和部分的抽氢自由基,在120 K附近所测得的ESR谱显示了脂质过氧自由基的波谱特征,随着温度继续上升,最后演变为戊二烯基自由基和α-碳抽氢自由基。亚油酸和亚麻酸与α-生育酚(摩尔比1:1)二元体系的ESR研究,揭示了α-生育酚对亚油酸和亚麻酸的辐射保护作用是基于氢原子转移机理。

Stable polysiloxane latex were prepared by emulsion copolymerization of ocamethylcyclotetrasiloxane (Me-D4) and tetravinyltetramethylcyclotetrasiloxane (Vi-D4) using H 2SO 4 as initiator.Crosslinking reaction between vinyl groups on various prepolymers was carried out in the precence of free radical initiator.The distribution of Me-D4 and Vi-D4 residues in the copolymer chain was discussed based on the kinetics data of emulsion ring-opening copolymerization.

用八甲基环四硅氧烷(Me-D4)与四甲基四乙烯基环四硅氧烷(Vi-D4)乳液聚合得到了聚硅氧烷乳液,通过乙烯基的自由基聚合反应得到交联的乳胶粒子从而制备出有机硅弹性粒子.对乳液聚合的动力学和共聚物组成进行了研究,同时讨论了Me-D4和Vi-D4残基在聚合链上的分布

Ethylenic radical, an uncommon intermediate has been introduced in this paper. The structures, preparation methods and intramolecular cyclization reactions of the ethylenic radical have also been reviewed and the application of the reactions in organic synthesis has also been discussed.

本文介绍了一种不常见的中间体——烯基自由基,并综述了它的结构、产生方法、分子内环化反应及在合成上的应用。

 
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