In chapter three, the activating agents of ytterbium have been examined. Barbier-type reaction promoted by ytterbium metal was examined. The experimental results shown that the yield of Barbier reaction of imines with allylic bromide promoted by ytterbium is higher than that of aldehydes and ketones with allylic bromide under the same reaction conditions. In this chapter, the reductive cleavage of Se-Se and S-S bond induced by ytterbium metal was also studied.

首先研究了金屬鐿的活化劑以及活化方法久久久www黄页免费网站，接著考察了金屬鐿促進的Barbier反應及其在合成高烯丙基胺和高烯丙基醇中的應用一级毛片性爱视频网站，以及影響該反應的主要因素；究了金屬鐿促進的二硫醚和二硒醚的S—S鍵和Se—Se鍵的還原斷裂91精品免费大秀，繼而與氯代烴黄色视频免费进入入口，胺基甲酰氯反應生成相應的硫醚，硒醚黄免费片网站入口处，胺基甲酸硫代酯和硒代酯精品第一国产综合亚洲午夜。

objective:to determine glucosinolates in draba nemorosa var.leiocarpa and provide the basic and science data for further development.methods:sulfate ion precipitation method was used.results:glucosinolate content was 0.95% in draba nemorosa var.leiocarpa.conclusion:there are more glucosinolates in draba nemorosa var.leiocarpa,which has greater value.

目的：測定光果葶藶全草中硫代葡萄糖苷的總含量，為進一步研究開發(fā)提供基礎科學資料国产v碰。方法：采用硫酸根離子沉淀法亚洲浮力第一页。結果：光果葶藶全草中硫代葡萄糖苷總含量為0.95%。結論：光果葶藶全草中硫代葡萄糖苷含量高色94色欧美一区，有較大的開發(fā)價值欧色色色。

The method comprises:(1) weighing lead acetate hexahydrate and thioacetamide, and preparing aqueous solutions respectively, so that the concentration ratio of Pd2+ to S is 1:(1-4);(2) adding acetic acid into thioacetamide solution to adjust the pH value to 2-4;(3) adding poly surfactant into lead acetate solution, ultrasonicating to mix uniformly and obtain a colorless and transparent sol;(4) mixing the sol and thioacetamide solution;(5) placing the mixed solution in a sealed container, irradiating by 2.5 MeV and 40 mA electron accelerator with irradiation dose of 25-40 Mrad;(6) washing the product, centrifuging for separation, and drying to obtain black PdS nanoparticles.

本發(fā)明方法的工藝過程如下：首先稱取一定量的六水合醋酸鉛和硫代乙酰胺，各自配制成水溶液99九九热爱视频精品免费，其濃度比為使其中的鉛離子濃度與硫原子濃度的比例為1∶1～1∶4爱搞网在线观看；在硫代乙酰胺溶液中加入適量醋酸調(diào)節(jié)其pH值至2～4；醋酸鉛溶液中加入少量表面活性劑聚乙烯醇久久wwwcom，然后超聲振蕩999国产精品免费，混合均勻，制成無色透明溶膠日韩在线观看网红自拍视频网站免费；隨后將溶膠與上述的硫代乙酰胺溶液混合黄色网站十八免进；將該混合液置于密閉容器中，并將其放置于2.5MeV91se国产在线视频、40mA的電子加速器產(chǎn)生的電子束輻照下進行輻照處理性色精品视频网站在线观看，其輻照劑量為25～40Mrad；然后將反應生成物清洗农村少妇A级毛片免费看，并用高速離心機離心分離成人免费国产剧情视频网站大全下载，然后干燥，最終得到黑色納米硫化鉛顆粒激情亚洲AV无码日韩色。

Analysis of the material change, garlic cells bioactive aliphatic thio cysteine sulfoxide and thiosulfate propenyl cysteine sulfoxide sulfur compounds in garlic, such as the role of enzymes, the generation of thiobarbituric acid sub - ester, propylene-based thiosulfinates, allyl thiosulfinates as garlic pigment precursor substances, and further changes occurred in the green garlic.

從物質變化分析国产精品香蕉AV，大蒜細胞中的生物活性物質硫代脂肪族半胱氨酸亞砜和硫代丙烯基半胱氨酸亞砜等含硫化合物在蒜酶的作用下，生成硫代亞磺酸酯久久精品久久久久久久久、丙烯基硫代亞磺酸酯、烯丙基硫代亞磺酸酯性爱网欧美优物性爱，作為大蒜色素物質的前體国产区在线，進一步發(fā)生大蒜綠變。

Besides, the derivatives were synthesized successfully by the similar acid binding agent system, such as tris(4-nitrophenyl) thiophosphate, tris(4-toluene)thiophosphate. The derivative of maleic anhydride was synthesized by the simple method, and its yield was above 90%.

采用類似的縛酸劑體系成功地合成了硫代磷酸三(4-硝基苯)酯欧洲熟妇色XXXX欧美在线观看、硫代磷酸三(4-甲基苯)酯国内亚洲精品无码久久，并用簡單的方法合成了硫代磷酸三(4-氨基苯)酯的馬來酸酐衍生物——硫代磷酸三(4-馬來酸氨基苯)酯国产免费播放网站，產(chǎn)率達90％以上。

Five of their single crystals were obtained and their structures were determined by X-ray diffraction. By comparison, it was found that dithiocabamate complexes often formed an exactly planar MS4 unit, such as [Mo(R2dtc)2]; and also formed a special MS 5 unit, such as [Cu2(R2dtc)4], the copper atom lies in a distorted square-pyramidal environment.Four kinds of heteropoly acids were prepared and characterized; a series of solid superacid catalyst of supported heteropoly acid were prepared and characterized; regioselectivites of chlorobenzene mononitration with nitric acid with different heteropoly acid on different supports and reaction conditions have been investigated.

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Glucosinolates and myrosinase are present in the vacuoles and in the de finite protosome in intact cell and tissues respectively. but when tissues and c ells are damaged, myrosinase will release and hydrolyze glucosinolates to genera te degraded products, such as isothiocyanates and so on.

在完整的植物中一区二区国产黄片，硫代葡萄糖苷存在于細胞的液泡中久久99视频，葡萄糖硫苷酶存在于特定的蛋白體中，兩者相互分離插插插射射射，但當組織和細胞受到損傷時夜色樱花网站，葡萄糖硫苷酶就會被釋放出來，葡萄糖硫苷酶將硫代葡萄糖苷水解国产亚洲欧美日韩久久图片，產(chǎn)生異硫代氰酸鹽等降解產(chǎn)物精品激情视频。

Thiobarbituric acid was synthesized by sulfourea and diethyl malonate in sodium alcohol and 5-Arylidene thiobarbituric acid was prepared by the Knoevenagel condensation reaction from benzaldehyde and thiobarbituric acid.

采用丙二酸二乙酯和硫脲在乙醇鈉存在下合成了硫代巴比妥酸，再分別采用固相反應和水相反應91精品欧美一区二区合在线，由硫代巴比妥酸和苯甲醛經(jīng)Knoevenagel縮合反應黄色的视频你懂的，制備了5-亞芐基硫代巴比妥酸。

TrithiocarbonatesS,S\'-bis (α,α′-dimethyl-α-acetic acid) trithiocarbonate (TTC1),3-(2-carboxyethylsulfanylthiocarbonylsulfanyl) propionic acid (TTC3),2-(2-carboxyethylsulfanylthiocarbonylsulfanyl) propionic acid (TTC4) and2-(2-carboxyethylsulfanylthiocarbonylsulfanyl)-2-methylpropionic acid (TTC5) weresynthesized by phase transfer method.

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The degradation properties of sulfide flotation collectors such as Xanthogenate, Dithiocarbamate, Dithiophophate, N,N-dialkyl-dithiocarbamatecyanoethylene and Thionocarbamate are studied in this paper.

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