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The mechanism was supposed as follows: polyfluoroalkyl iodides were initiated by sodium dithionite to give R〓 which was added to one double bond of diallylacetic acid, after the sequential radical cyclization and nucleophilic substitution to form bicyclo-lactones.

这是因为:多氟烷基碘化物在连二亚硫酸钠的引发下,得到自由基R〓,后者加成到二烯丙基乙酸中的一个—C=C—双键上,然后在碱性介质中进行分子内亲核反应得到双环内酯类产物。

The influence of the loading of iodine, reaction solvent, the structure of imine and enol ethers was studied.

详细考察了碘的用量、反应溶剂、亚胺和烯醇醚的结构对反应的影响。

One pot synthesis of tetrahydroquinolines from aldehyde, aniline and enol ethers catalyzed by iodine was also applicable and provided tetrahydroquinolines in comparable yields.

在碘的催化下,从醛、苯胺和烯醇醚出发"一锅"合成了四氢喹啉衍生物,反应的产率与使用预制的亚胺进行的反应基本相同。

In HCl medium, iodate oxidizes hydroxylammonium chloride to form nitrite, which can produce a red azo dye with the reaction of p nitroaniline and α naphthylamine.

基于碘酸根在稀盐酸介质中氧化盐酸羟胺产生亚硝酸根,而亚硝酸根和对硝基苯胺重氮化后可以与α-萘胺偶联产生红色偶氮染料,提出了分光光度法测定碘的新方法。

According to the reducibility of sodium thiosulfate ,the interference of sulfite is eliminated by formaldehyde and sodium thiosulfate is determined by indirect iodimetry with addition of excessive iodine.

根据硫代硫酸钠的还原性,以甲醛消除亚硫酸盐的干扰,加过量碘,间接法测定硫代硫酸钠。

The biomimetic monooxygenation of cyclohexane with some substituted iodosobenzene and iodosobenzene derivatives catalyzed by 5,10,15,20-tetraphenylporphinatoiron chloride was studied.

在氯合5,10,15,20-四苯基卟吩合铁催化下,带有不同取代基的亚碘酰苯和亚碘酰苯的衍生物作充氧化剂对环己烷进行了仿生单充氧化反应的研究。

The oil is highly unsaturated, with an iodine number of 185 to 208, and includes linolenic, linoleic, and oleic acids.

石油是高度不饱和,与一碘的人数185至208 ,并包括亚麻酸,亚油酸,油酸。

The cis-decalin 79 was obtained from 2-methoxy-4-methylphenol (77) via a sequence of reactions involving intermolecular Diels-Alder reaction of masked o-benzoquinone derived from 77 and ethyl vinyl ketone, silyl enol ether formation and Cope rearrangement.

第一部份:以2-甲氧基-4-甲基酚(77)为起始物,经由二乙醯基亚碘苯氧化、分子间Diels-Alder反应、烯醇矽醚的形成及Cope重排反应得到具有十氢萘骨架化合物79。

Iodine levels increase from lignite through subbituminous coal and bituminous coal to anthracite,it indicates that coal adsorbed excess iodine from the hydrothermal fluids during the process of metamorphism,including geothermal metamorphism and telemagmatic metamorphism.

从褐煤、亚烟煤、烟煤到无烟煤,碘的含量越来越高,表明在变质作用(含深成变质作用和区域岩浆热变质作用)过程中煤吸收了热液流体中的碘。

Iodine in the test solution was oxidized to IO-3 by excessive amounts of potassium permanganate solution and sodium hypochlorite solution,and excess of the oxidants was removed by reacting with sodium sulfite solution.

采用过量联合氧化剂高锰酸钾-次氯酸钠氧化试液中碘至IO3-,剩余的高锰酸钾和次氯酸钠用过量的亚硫酸钠反应除去,利用IO3-的电活性,建立了在四硼酸钠-吐温-80底液中的线性扫描伏安法测定微量碘的方法。

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