Its mechanism is the use of anthraquinone in alkali conditions off proton surface forming 10 more stable carbon anion face, but because carbon anion and oxygen ion exist between testosterone and enolate type each other changes, cause reaction product complex, at least five, reaction selectivity, product yield, separation difficulties, and product purity is not high, therefore, using the type and quantity of alkali, phase transfer catalyst type, solvent, to optimize the selection process conditions so as to improve the yield target product.

其機(jī)理是利用蒽酮在堿存在的條件下脫去氫質(zhì)子面形成10位較穩(wěn)定的碳負(fù)離子面進(jìn)行18禁超污无遮挡无码大尺度，但是因?yàn)樘钾?fù)離子和氧負(fù)離子之間存在酮式和烯醇式的互變，導(dǎo)致反應(yīng)復(fù)雜中文图小说视频，產(chǎn)物至少有五種视频。在线男女国产，反應(yīng)選擇性差，產(chǎn)物分離困難91手机视频在线，產(chǎn)率低亚洲欧美精品综合久久小说，且產(chǎn)品純度不高，因此午夜欧美黄色，利用對(duì)堿的種類和量的多少国产在线观看小视频，相轉(zhuǎn)移催化劑的種類，反應(yīng)溶劑的選擇日本黄色网视频站，來(lái)優(yōu)化反應(yīng)工藝條件從而提高目標(biāo)產(chǎn)物的產(chǎn)率国产黄色孕妇网站。

Two kinds of high alcohol acrylates were prepared by octadecyl alcohol and hexadecyl branched alcohol,respectively.The polymers of depressants were prepared by maleic anhydride-styrene-higher alcohol acrylates.By using these depressants,the pour points of the Liaohe crude oils were lowered form 30℃ to 20℃.

分別采用碳十八直鏈醇、碳十六支鏈醇與丙烯酸合成烷基酯看农村黄色视频，將烷基酯再與順丁烯二酸酐bbixx视频在线看、苯乙烯聚合制備的三元共聚物，對(duì)遼河油田的高凝原油的降凝效果進(jìn)行了評(píng)價(jià)欧美岛国在线，實(shí)驗(yàn)發(fā)現(xiàn)這兩種聚合物對(duì)凝固點(diǎn)為30℃原油都具有較好的效果人人操黄，降幅可達(dá)10℃左右，但對(duì)凝固點(diǎn)為41℃的原油較差分別為3℃和6℃人人人人操在线国产。

The experimental condition of α-hexylene prepared by o-hexanol dehydration employing a zinc aluminate catalyst was studied in this paper.

本文采用鋅鋁鹽作為催化劑日本同步大片，對(duì)正己醇脫水制備α-己烯的實(shí)驗(yàn)條件進(jìn)行了研究欧美精品第五页，以期能拓寬高碳醇的使用領(lǐng)域，對(duì)高碳醇的綜合利用進(jìn)行進(jìn)一步探索。

Besides, the efficacious concentration of either morrhuic acid or sodium morrhuate was 0.1%, so they contained more docosahexaenoic acid and eicosapentaenoic acid and were ideal spermicides in vitro.

所以黑人与黑人作爱A级毛片，含有較多廿二碳六稀酸中文字幕欧洲有码无码、廿碳五烯酸的魚(yú)肝油酸和它的鈉稱是較為理想的體外殺精子劑欧美日韩a√播放三区。

Assignments have been made on the spectra for all peaks of the Aliphatic and olefinic carbons using chemical shift corrective terms together with furukawa parameters.

本工作用~(13)C-NMR進(jìn)行了研究无遮无挡爽爽免费视频毛片，得到的聚合物的~(13)C-NMR圖譜表明，聚合物的脂碳部分共有十一個(gè)共振峰caopo免费公开视频公开，烯碳部分有九個(gè)峰国产精品日韩色无码中出。

In this dissertation, electrophilic reactions of Nitrosonium with imines, aza-Diels-Alder reactions of N-arylimines with a variety of electron rich olefinic compounds induced by NO~+, and photoreactions of N-nitrosodiphenylamine with aromatic amines were studied.

本文研究了：(1)NO~+與亞胺雙健發(fā)生的親電反應(yīng)；(2)NO~+引發(fā)的芳香亞胺和富電子碳碳雙鍵作為親二烯體的氮雜Diels-Alder反應(yīng)专业偷拍熟女在公司里偷星图片，高選擇性地得到了一系列四氫喹啉的衍生物视色视色网；(3)N—亞硝基二苯胺與芳香胺發(fā)生光化學(xué)反應(yīng)得到了一系列偶氮苯類化合物。

The reaction of cyclic b-keto esters with CF3CO2ZnCH2I provides the corresponding ring-expanded products with the advantage of mild condition in moderate to good yields. A simple and efficient procedure has been developed for a variety of 1,3-diketones converted into the corresponding 1,4-diketones and trans-1,2-disubstituted cyclopropanols in high yields. In conclusion, this new type of organozinc reagents has been developed for many useful reaction in organic synthesis.

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Itis main raw material of tetradecane,others applications include:liquid mosquito-repellent incense,hydraulic oil of large-scale punch,paraffin chloride,anticorrosive paint.powder paint,and top-grade melt adhesive,its derivative is chainpoly-anhydride of 14c binary acid,it is very useful chenical and medical intermediate,it can be used ad curing agent of epoxy and propylene resin,polyester improved additive etc.

外觀與性狀無(wú)色液體，溶解性不溶于水男的把女的操出高潮的视频，可混溶于乙醇欧美16一17sex性HD、乙醚是生產(chǎn)十四碳烷烴的主要原料，其它應(yīng)用包括：液體蚊香黄色视频在线看免费、大型沖壓機(jī)的液壓油裸体洗澡自拍偷拍网站、氯化石蠟、防腐涂料三及A片人人看呢、粉末涂料也可用作高檔熱熔膠日韩无码另类，其衍生產(chǎn)品十四碳二元酸的直鏈聚酐，是一種非常有用的化工及醫(yī)藥中間體色色色色色色色色色色网，可用于環(huán)氧及丙烯樹(shù)脂固化劑激情欧美老妇视频、聚酯改性添加劑等等。

The stable carbon isotope s of saturated hydrocarbon and specific compound composition of the oil from the trachyte near the crater are relatively low,and the negative anomalies of the .

通過(guò)對(duì)歐利坨子原油地球化學(xué)特征的研究三级片黄色网站视频真人，發(fā)現(xiàn)原油性質(zhì)的差異同儲(chǔ)集層與火山口的相對(duì)位置有著密切的關(guān)系亚洲国产人成自久久国产，在火山口附近的粗面巖儲(chǔ)集層中，原油的飽和烴及其單體碳同位素值偏輕亚洲综合色图一区，類異戊二烯烴的碳同位素負(fù)異常基本消失在线亚洲黄色中文字幕视频，原油的CPI和OEP值較低(平均為1·21和1·06)综合精品视频一区二区。

The results available now indicate that glass-like carbon synthesized from phenolic resin is a non-graphitizing carbon, and consists of both sp 2-hybridized carbon atoms that form imperfect graphite structure and sp 3-hybridized carbon atoms that are due to the presence of disordered carbon; and in the fullerene-related structure of glass-like carbon, there exist some pentagons and heptagons carbon rings.

玻璃炭作為一種特殊炭材料已廣泛應(yīng)用于許多領(lǐng)域，其制備97人人操日日干、性質(zhì)免费射黄视频、應(yīng)用以及基本結(jié)構(gòu)的研究已經(jīng)取得了很大的進(jìn)展，已有的研究結(jié)果表明酚醛樹(shù)脂基玻璃炭是一種典型的非石墨化炭材料性爱777，由 sp2雜化態(tài)碳原子和 sp3雜態(tài)碳原子組成人人摸人人干人人操，且在其類富勒烯結(jié)構(gòu)中存在五元環(huán)和七元環(huán)。