The author and his colleagues have performed the experiment before the introduction of electro- philic aromatic substitution or enolate halogenation in lectures.

作者和他的團隊在介紹親電芳基取代或烯醇鹵化的課程前已經(jīng)進行了實驗影音先锋AV网站你懂得。

In this dissertation, I will represent my studies on the nitration of Chalcone derivatives, reaction of epoxide ketone, and the aromatization of 3,5-disubstitued 2-isoxazolines with nitric oxide.

本文主要研究了：(1)NO與查爾酮及其衍生物的硝化反應(yīng)色综合久久综合网88，反應(yīng)以較高的產(chǎn)率得到了a-硝基化合物樱花在线导航成人网站入口免费；(2)NO對環(huán)氧酮的開環(huán)反應(yīng)欧美三級片AAAA，反應(yīng)生成了順式羥基硝酸酯一级啪啪啪免费视频；(3)3久久AA视频，5-二取代的-2-異惡唑啉在NO作用下可以發(fā)生芳環(huán)化反應(yīng)，生成了對應(yīng)的2-異惡唑化合物久久99con。

In the forth part, in the presence of chiral phosphoric acid, highly enantio-enriched (up to 98% ee)α-aryl glycine derivatives could be synthesized via asymmetric transfer hydrogenation of the α-aryl imino esters using Hantzsch ester as the hydrogen source.

第四部分工作中国产综合亚洲一区二区三区播放，利用Hantzsch酯作為氫源，高對映選擇性地實現(xiàn)了手性磷酸催化芳基酮酸酯亞胺的不對稱仿生氫化反應(yīng)XXXX白人性与XXXX黑人，以最高98％的對映選擇性得到苯甘氨酸衍生物色狼av窝电影。

Four different ionic liquids, BF4, BF and PF6 were investigated, arid PF6 showed the best effect when used as the reaction media, giving the highest yield in the shortest reaction time. Promoted by KF in PF6, N-aryl or N-alkyl monosubstituted sulfonamides could react with various activated halides and unactivated primary halides smoothly. Reactions were performed at 85℃ for 2~10 hours, and thirteen N-alkylation products were obtained with 70%~97% yields. Moreover, the ionic liquid recovered could be reused for three times with no appreciable decrease in yield and reaction rate.

結(jié)果表明，以PF6為反應(yīng)介質(zhì)時顯示出了最好的效果免费看黄色视频的网站在线观看，反應(yīng)的時間最短国产一级毛片喷潮视频，收率最高。N-芳基或N-烷基單取代的磺酰胺和各類不同結(jié)構(gòu)的活化的鹵代烴和未活化的一級鹵代烴在PF6中KF作用下黑白xxxxx，85℃反應(yīng)2~10h在线观看视频资源www网站18，以70%~97%的優(yōu)良收率得到了13個N-烷基化產(chǎn)物，而且離子液體回收使用3次后效果未降低99国产精品视频。

The pyridinium salts was transformed by the base to 1-hydroxy or 3-hydroxy-quinolizinylides, which undergo 1,3-dipolar cycloadditionreaction with alkenes,and then aromatizated to cycl[3,3,2]azinone in thepresence of oxidant.

實驗證明亚州视屏，這是一個連續(xù)進行的多步反應(yīng)：2-羰基吡啶鎓鹽在反應(yīng)中先生成1-羥基或3-羥基喹嗪葉立德，然后與烯烴起1黄色视频,黄色网站,黄色视频免费观看。，3—偶極加成反應(yīng)亚洲国产人成在线观看，最后在氧化劑作用下脫氫芳構(gòu)化而生成Cycl[3jiujiure精品，3，2]azinone亚洲激情国产一区精品。

It was demonstrated that the novel functional hyperbanched polyethylene could be prepared by the copolymerization of ethylene and polar comonomers protected by alkyl or aromatic silyl group.

研究表明国产精品久久久，經(jīng)烷基或芳基硅烷基團保護的極性單體與乙烯在MHNB催化作用下，通過共聚可以得到結(jié)構(gòu)新穎的功能性超支化聚乙烯人人干人人操在线。

Comparisons between the experimental and computational IR spectra clarify the difference of the open- and closed-ring isomers, which indicate that it is possible to identify the tautomeric form of this diarylethene derivative using a highly selective infrared absorption band and the strong absorption at 1 705 cm-1 of the ring-closed isomer can be used in non-destructive readout by IR light.

通過紅外吸收光譜表征了該光致變色二芳基乙烯衍生物在溶液中開色哟一区二区在线看、關(guān)環(huán)前后結(jié)構(gòu)的變化，并采用理論化學(xué)計算方法研究了該化合物開精品国产点击网站、關(guān)環(huán)異構(gòu)體的紅外吸收振動特性欧美日韩性爱网络。光致變色異構(gòu)化過程可以通過紅外吸收光譜的變化而識別。關(guān)環(huán)異構(gòu)體在1 705 cm

A series of urea,thiourea and thiodiazole derivatives bearing mercaptotetrazole were synthesized using NaN_3 as a nitrogen source.

以疊氮化鈉為氮源色一情一乱一伦一区二区三欧美，合成了一系列含四唑環(huán)的芳基脲及噻二唑類化合物99视屏在线，其結(jié)構(gòu)經(jīng)1H NMR，IR和元素分析表征成年人看免费视频大。

Besides, n-butyl and sec-butyl tosylate that are difficult for oxidative addition can react with phenylmagnesium bromide to form corresponding cross-coupling products. Primary alkyl halide which contains β-hydrogen and is relatively hard to undergo the reaction , n-butyl chloride for instance, can react with aryl Grignard reagents in the presence of NiB alloy as well.

此外国产精华Av在线导航网站，難以進行氧化加成的對甲苯磺酸正丁酯和對甲苯磺酸仲丁酯可以與苯基溴化鎂作用生成相應(yīng)的交叉偶聯(lián)產(chǎn)物；反應(yīng)相對困難的含β-H的伯鹵烷2021无码影片，如：正氯丁烷也可以在NiB催化下與芳基格氏試劑發(fā)生偶聯(lián)国产人与动人物a级毛片。

METAL ARYLS, WATER

鹵化芳基金屬，遇水反應(yīng)拍拍黄色网站，未另作規(guī)定的