Generation of 15N labelled bis(polyfluoroalkyl) nitroxides and their hydrogen-abstraction reactions with alkanes, alkylbenzenes and aldehydes
作者:Cheng-Xue Zhao、Guo-Fei Chen、Xi-Kui Jiang
DOI:10.1016/s0022-1139(00)81074-x
日期:1988.3
Blue solutions containing 15 labelled bis(polyfluoralkyl) nitroxides and spin traps, polyfluoronitrosoalkanes, were conveniently made from the reactions of Na15NO2 with polyfluoro-compounds, (RFCO2) and RFSO2Br in F113. It has been found that the nitroxides effected fast H-abstraction from alkanes, alkylbenzenes, aldehydes and the radicals derived from the substrates were in turn effectively trapped
由Na 15 NO 2与多氟化合物(R F CO 2)和R F SO 2 Br在F113中的反应可方便地制备包含15个标记的双(聚氟烷基)氮氧化物和自旋阱,多氟亚硝基链烷的蓝色溶液。已经发现,氮氧化物有效地从烷烃,烷基苯,醛中快速吸氢,而衍生自底物的自由基又被R F 15 NO有效地捕获,得到15 N标记的可通过ESR检测的自旋加合物。N越大(15 N)值以及氮氧化物和自旋加合物的简单拆分,使得对H原子吸收和其他自由基反应的动力学研究变得十分可行。
Di--butyl nitroxyl - radical induced homolysis of polyfluorodiacyl peroxides
In the presence of di--butyl nitroxide (DTBNO) polyfluorodiacylperoxides undergo rapid decomposition in -pentane or CClF2-CCl2F at −50 to +20°C. The reactions are first order in peroxide and DTBNO. On the basis of ESR observation of -butyl polyfluoroalkyl nitroxides as well as product analysis, it appears that the decomposition processes involve DTBNO inducedhomolysis of the peroxy bonds followed
A number of poly- or perfluoroalkyl t-butyl nitroxides RFN(Oo)tBu have been generated by a new method which makes use of the electron- transfer initiated reaction between polyfluoroalkyliodides and various electron donors, i.e., MNO2, CH2NO2Na, MeCHNO2Na, Me2CNO2Na and Na2S2O4, in the presence of 2-methyl-2-nitrosopropane. Substituent effects on the hyperfine coupling constants aN and aβF values are
一些聚或全氟烷基叔丁基氮氧自由基- [R ˚F N(0 ö)TBU已经通过一种新的方法,其利用多氟烷碘化物和各种给电子体之间,即电子-的转移引发的反应的,产生的MNO 2,CH在2-甲基-2-亚硝基丙烷存在下,使用2 NO 2 Na,MeCHNO 2 Na,Me 2 CNO 2 Na和Na 2 S 2 O 4。上的超精细耦合常数的取代基影响Ñ和β ˚F值进行了讨论
FLUORINE-CONTAINING POLYMER HAVING HETEROAROMATIC RING
申请人:Komatsu Yuzo
公开号:US20090105400A1
公开(公告)日:2009-04-23
There is provided a fluorine-containing polymer having an ionic group which has a heteroaromatic ring and is useful as a material comprising various heteroaromatic ring compounds having a stable fluorine-containing heteroaromatic ring, and further a fluorine-containing polymer having a heteroaromatic ring which is useful as a starting material of the above-mentioned polymer or a curing agent. Also, there is provided a fluorine-containing polymer having a heteroaromatic ring such as imidazole in its side chain, a polymer salt thereof, and a polymer composition comprising such a polymer and a polymer salt and a nano filler.
A fluorine-containing copolymer comprising monomeric units of
(a) from 95.8 to 80% by weight of tetrafluoroethylene,
(b) from 4 to 14% by weight of hexafluoropropene, and
(c) from 0.2 to 6% by weight of perfluorovinyl ether of the formula:
wherein n is an integer of 1 to 4, and m is an integer of 0 to 3, and having excellent stress crack resistance.