The optimum reaction conditions were: at present of acetic anhydride, a stoichiometric quantity of nitric acid, at room temperature for 40 minutes. Nitration of chlorobenzene gave a,50% yield of mononitro compounds, and an ortho-para isomer ratio 0.20 in product distribution of chlorobenzene mononitration.

結(jié)果表明：硅鎢酸催化性能較好色五月综合性，催化劑載體以納米二氧化硅最好，反應(yīng)條件中醋酸酐用量是主要影響因素免费A级毛片无码免费视频120软件；SiW_(12)O_(40)~(4-)／納米SiO_2催化劑具有強(qiáng)對(duì)位選擇性：在醋酸酐存在下欧美性爱A√视频在线，氯苯與等當(dāng)量的硝酸室溫下反應(yīng)40分鐘，氯苯一硝化產(chǎn)物中鄰／對(duì)硝基氯苯異構(gòu)體的質(zhì)量比達(dá)0.2婷婷五月天激情综合网，產(chǎn)率可達(dá)50％jiZZ成熟丰满。

In a monophase microemulsion where the oil phase was replaced by an ionic liquid, high ortho-selectivity of nitration of phenol can be achieved.

在以離子液體取代庚烷形成的單相微乳液體系中，則可以獲得較高的鄰位選擇性国产美女一级大黄片之怀孕疯狂操。

First of all, a monophase microemulsion was prepared with Triton X-100 as surfactant, and the nitration of phenols by concentrated nitric acid in the systems was studied. The influence of the mass fraction of nitric acid, oil/water volume ratio, reaction temperature and other factors on the reaction conversion and selectivity was examined.

首先在非離子表面活性劑Triton X-100形成的單相微乳體系中无码少妇一区二区三区av，用濃硝酸對(duì)苯酚進(jìn)行選擇性硝化反應(yīng)，研究了硝酸的質(zhì)量分?jǐn)?shù)白白在线视频免费费观看、微乳中油/水比日本不卡的涩涩网站、反應(yīng)溫度等因素對(duì)反應(yīng)轉(zhuǎn)化率及硝化選擇性的影響。

The nitration of toluene was carried out in the presence of acetic anhydride with CCl4 as solvent, 95% nitric acid as nitrating reagent, and niobic acid calcinated at 300℃ for 3 h as catalyst for 60 min at 40℃.

實(shí)驗(yàn)結(jié)果表明亚洲黄黄视频，當(dāng)反應(yīng)溫度為40℃国产精品路边搭讪素人，反應(yīng)時(shí)間為60min時(shí)，以CCl4為溶劑国产夫妻视频，以質(zhì)量分?jǐn)?shù)為95%的硝酸為硝化劑久久只精品99品免费久苍井空，在醋酐存在條件下，以經(jīng)300℃焙燒3h后的鈮酸作為催化劑久久国产亚洲欧洲一区二区，甲苯硝化產(chǎn)物中異構(gòu)體的鄰對(duì)比達(dá)1.2691黄色大片在线观，較硝硫混酸的1.67顯著降低，產(chǎn)物得率達(dá)99.3%男人天堂精品自拍。

Amino 5 nitrophenol was synthesized using o aminophenol and urea as raw materials through cyclocondensation ,nitration and alkaline hydrolysis in turn.

以鄰氨基苯酚和尿素為原料国产美女自慰喷水，對(duì)環(huán)合、硝化AAA级草久影院、堿性水解的傳統(tǒng)工藝進(jìn)行改進(jìn)国产亚洲日韩欧美性爱视频在线，合成了 2 氨基 5 硝基苯酚。

The reactions include, organometallic reactions (grignard reaction, organolithium -zinc, and -copper chemistry ), metal catalyzed reactions, mannich reaction, nitration, hydrogenation, azidation, amino-protection reactions, organoalluminum catalyzed beckmann rearrangement, schmidt rearrangement, epoxidation, epoxide ring opening reactions, swern oxidation etc.

這些反應(yīng)包括：有機(jī)金屬反應(yīng)(格利亞反應(yīng)，有機(jī)鋰亚洲欧美一级A片综合，有機(jī)鋅和有機(jī)銅反應(yīng))aiai视频在线观看，金屬催化反應(yīng)堆(suzuki 反應(yīng)， negish 反應(yīng))啪啪黄色， mannish 反應(yīng)www,jizzcom，硝化反應(yīng)，氫化反應(yīng)国产精品自拍无码，疊氮反應(yīng)久久狠狠高潮亚洲精品，各種基團(tuán)的保護(hù)和脫保護(hù)反應(yīng)，有機(jī)鋁催化的貝克曼重排反應(yīng)99这里99这里只有是精品，斯密特重排反應(yīng)天天操天天色天天射，環(huán)氧化反應(yīng)，環(huán)氧烷開(kāi)環(huán)反應(yīng)国产一区色， swern 氧化反應(yīng)等欧美一区1区三区3区公司。

The results show that air plasma causes surface wettability improvement, surface roughness, surface oxidization and nitration.

結(jié)果表明：處理后表面潤(rùn)濕性改善，表面微結(jié)構(gòu)形貌粗糙化黄色免费的网视频，表面發(fā)生氧化和氮化新赏网在线一区二区。

In order to solve the problem of producing large amounts of wastes and undesired o-nitrotoluene in synthesis of p-nitrotoluene with the mixed concentrated mineral acids,the catalytic activity of phosphotungstic acid for selective nitration of toluene was studied and the optimum conditions for preparing the catalyst were investigated.

為解決硝硫混酸對(duì)硝化甲苯過(guò)程中因甲苯的非選擇性硝化產(chǎn)生的o-MNT和大量廢酸對(duì)環(huán)境的危害，研究了磷鎢酸對(duì)甲苯硝化反應(yīng)的催化活性74色色网。

Further study demonstrated that peroxynitrite also induced tau nitration in neuroblastoma N2a cell line, and the nitrated tau was accumulated in the cells.

進(jìn)一步研究發(fā)現(xiàn)：用PN處理穩(wěn)定表達(dá)tau蛋白的N2a細(xì)胞免费A片大大片，可以誘導(dǎo)細(xì)胞內(nèi)tau蛋白的硝基化，而且硝基化的tau蛋白在細(xì)胞內(nèi)發(fā)生聚積扁豆曰本熟妇不卡无码一、二区在线费看。

Our purposes are to research and sieve direction-selected nitration agents which will be added to the process of when chlorobenzene is nitrated and to make reaction proceed toward ONCB and to raise the proportion of ONCB to 40-50%.

本項(xiàng)目通過(guò)對(duì)定向硝化劑的研究和篩選榴莲视频在线下载地址ios，在氯苯硝化時(shí)加入選定的定向硝化劑，使硝化向鄰位定向進(jìn)行一级毛片不卡免费，提高鄰硝比例達(dá)到40～50%天天综合色一级毛片中国。