A novel carbonyl transposition led by anilines'nucleophilic addition to methyl 2-keto α-D-glucopyranoside was discovered. And the mechanism of the reaction concerned to an enol rearrangment was provided through tracing the change of 〓H-NMR and 〓C-NMR of a hemiacetal intermediate which was obtained in the reaction of o-phenylene diamine with 2-keto glycoside. Both the intermediate and the converting product were identified by 〓H-NMR,〓C-NMR,〓H-〓H COSY and HMQC.

一一级精品视频久久免费视频观看、發(fā)現(xiàn)了2-位氧化α-甲基D-葡萄糖苷的芳胺親核加成引起羰基轉(zhuǎn)位的新方法人妖色偷偷福利网站，利用核磁共振氫譜及碳譜對(duì)鄰苯二胺與2-位氧化α-甲基D-葡萄糖苷加成生成的穩(wěn)定中間體半縮酮化合物在氘代丙酮中的變化進(jìn)行跟蹤国产免费黃色视频，結(jié)合對(duì)轉(zhuǎn)化產(chǎn)物的氫氫相關(guān)譜和HMQC結(jié)構(gòu)確證日本三级日本成网人站，提出了該反應(yīng)中2-位羰基通過烯醇化互變而轉(zhuǎn)至3-位的機(jī)理并得到了驗(yàn)證爱搞在线2019。

The synthesis parameters such as reaction time, reaction temperature, and the addition amount of inhibitor were discussed.

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The effect of the addition of the crystal seed in the jarosite preciptation was investigated and the results showed that the crystal seed would accelerate the crystallizing rate of jarosite formation, which convert the reaction mechanism from the crystallization kinetic rate control into the chemical reaction kinetic control.

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The effects of reaction temperature, reaction time, catalyst dosage, addition of esterification agent and the ratio of monoglyceride to glycerol were examined.

分別考察了反應(yīng)溫度人人干人人射欧美、反應(yīng)時(shí)間插插插xxxx视频、催化劑添加量、酯化劑添加量和單甘酯與甘油的比例對(duì)酸值的影響午夜视频又黄又爽。

In chapter 4 an abnormal reaction that the nitro group of 1-aryl-2-nitroethenescan be easily replaced by the organic moity of FG-RZnI using Ni〓 and tertiaryamine as catalyst was first given. The experimental results show that in the presenceof catalytic amount of Ni〓 and tertiary amines, the reaction of FG-RZnI andl-aryl-2-nitroethenes give the substitution products l-aryl-l-alkene, instead ofMichael addition products.

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The result showed that the optimal condition of inorgano-absorbent manufacture as following: concentration of vitriol is 15%, the bentonite carrier must be soaked in the 0.4% La(superscript 3+) solution, the pH is 10, microwave radiation power is 340 W for 5 min. The optimal condition of organo-absorbent manufacture process as following: concentration of CTMA is 5%. The rate of wave must 166 W and the time of radiation is 6 mi In addition, the experimental results showed that with inorgano-absorbent the pH number is 3~6 and the reaction time is 45 min, the removal efficiency of phosphor will be up to 99% and the amount of adsorption will be up to 41 mg/g. And with organo-absorbent the pH number is 3~4 and the reaction time is 45 min, the removal efficiency of phosphor is more 30% than that of inorgano-absorbent. The removal efficiency of phosphor will be up to 99% and the number of adsorption will be up to 60 mg/g.

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The influence of the addition of element S of vulcanization reaction,the ester-exchange agent/rape seed oil of ester-exchange reaction and the R-OH/ P_2O_5 of phosphate re...

試驗(yàn)考察了硫化反應(yīng)的硫化劑添加量天天传媒91精品AⅤ、酯交換反應(yīng)的交換劑與油的摩爾比以及磷酸酯化反應(yīng)的R—OH與P2O5的摩爾比對(duì)產(chǎn)物結(jié)構(gòu)和性能的影響69国产A片。

Master the Keto-Enol tautomerism; reactions of enols:α-H substitution reactions;α-halogenation of aldehydes and ketones;α-bromination of carboxylic acids; acidity ofα-H atoms: enolate ion formation; reactivity of enolate ions; alkylation of enolate ions; mechanism of carbonyl condensation reactions;condensations of aldehydes and ketones: the Aldol reaction; dehydration of Aldol products; the Claisen condensation reaction; the Michael addition.

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Therefore, this paper studied on scorched flavor boiled sunflower seed Processing Technology, tried to find out evidence of increase flavor by maillard reaction and caramelization, and analysed scorched flavor content by GC/MS. The results obtained were as follows: Used maillard reaction and caramelization to optimize sunflower seed sugar addition, baking time, baking temperature, spreading thickness, increase scorched flavor of boiled sunflower seed.

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In the Cu-catalyzed enantioselective 1,4-conjugate addition of diethylzinc to acyclic enones, the reaction conditions, such as the amount of diethylzinc, solvents, temperature and the reaction time, were investigated in detail with 9a as the standard ligand and chalcone as the typical substrate.

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