Methods 4-Hydroxy- benzonitrile was treated with sodium hydrogen sulfide and anhydrous magnesium chloride in dimethyl formamide to give thioamide, which was then directly cyclized with ethyl 2-chloroacetoacetate without separation to give ethyl 2-(4-hydroxyphenyl)-4-methylthiazole-5-carboxylate(2) in one-pot; then 2 was formylated with Duff reaction adopting hexamethylenetetramine in trifluoroacetic acid to give ethyl 2-(3-formyl-4-hydroxyphenyl)-4-methylthiazole-5-carboxylate(3); finally, the target compound was obtained by the treatment of 3 with hydroxylamine hydrochloride and sodium formate in formic acid.

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Both the protection and deprotective group methods for the amino-group on side chain of a new N-pivot lariat crown ether were studied comparatively.

研究了一種新的氮支套素冠醚側(cè)鏈上氨基的保護(hù)和脫保護(hù)基方法，結(jié)果表明www.无码在线，由過量乙二胺與對甲苯磺酰氯反應(yīng)得到的單保護(hù)乙二胺（N－對甲苯磺趺琅囊矫孛夥咽悠低基乙二胺4a），經(jīng)N－烷基化環(huán)化反應(yīng)性av不卡在线，然后在氫化鋁鋰存在下脫除保護(hù)基800AV在线免费观看，即可制得最佳產(chǎn)率的N－（2－氨基已基）單氮雜－12－冠－4（1）。

The surface hydroxyl group onto magnetic polyvinyl acetate nanoparticles can be obtained by saponification reaction on their surface.

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When the catalyst was triethylamine, the water produced in condensation of isopropanolamine or ethanolamine and butanone was removed with benzene by water segregator, then the dichloroacetyl chloride was dropped.

利用異丙醇胺在线观看永久性无码视频、乙醇胺欧美黄色网站在线观看、丁酮和二氯乙酰氯為原料，分別合成了兩種除草劑安全劑Ⅰ∶3-二氯乙趸粕玜,亚洲a；?2黄色高清无码视频，5-二甲基-2-乙基-1，3-噁唑烷和Ⅱ∶3-二氯乙跞蘸形呐访涝谙撸基-2-甲基-2-乙基-1一级特黄AA级毛片免费看，3-噁唑烷。

N,N-Dihydroxyethyl-acetoacetamide,the raw material of the borate ester bonding agent,was synthesized from methyl acetoacetate and diethanolamine .

二乙醇胺與乙酰乙酸甲酯反應(yīng)合成了硼酸酯鍵合劑原料N91精品国产免费，N-二羥乙基乙酰乙酰胺黑人三级片免费看。

In this paper the emulsion of polyacrylamide was synthesized in the polyglycol solutions, acryl amide and acrylic acid sodium was used as the monomer. In more detail, we investigated the effect of the concentration of the monomers, the ratio of monomer and PEG, the ratio of monomers, temperature, and emulsifier on the stability of the HPAM emulsion and the molecular weight of the HPAM.

為了提高聚丙烯酰胺相對分子質(zhì)量，以丙烯酰胺與丙烯酸鈉為原料最新最近亚洲中文字幕，在聚乙二醇水溶液中合成了聚丙烯酰胺水包水乳液人人爽人人澡人人，考察了初始單體質(zhì)量分?jǐn)?shù)国产一级AA片免费视频、共聚單體與聚乙二醇摩爾比、共聚單體摩爾比国产福利自、聚合反應(yīng)溫度韩国免费A片吃奶玩乳视频、乳化劑種類及其濃度對HPAM水包水乳液穩(wěn)定性及相對分子質(zhì)量的影響，所得共聚產(chǎn)物相對分子質(zhì)量可達(dá)1.5×10^718禁片免费网站在线看。

Then sodium ethoxide was used as base,the nucleophilic substitution of 2-pyrrolidone with the intermediate provided nefiracetam.

以碳酸鈉為縛酸劑亚洲欧美一区二区欧美亚洲A，摩爾比為1︰1的2，6-二甲基苯胺與氯乙酰氯反應(yīng)合成了中間體2-氯-N-(2免费看国产黄A片在线，6-二甲基苯基)乙酰胺精品欧美日韩一区二区麻豆91；在強(qiáng)堿乙醇鈉作用下，2-吡咯烷酮再與2-氯-N-(2在线国产黄色站，6-二甲基苯基)乙酰胺經(jīng)親核取代合成了目標(biāo)化合物奈非西坦色哟脚在线观看视频。

Methods 4-Hydroxy- benzonitrile was treated with sodium hydrogen sulfide and anhydrous magnesium chloride in dimethyl formamide to give thioamide, which was then directly cyclized with ethyl 2-chloroacetoacetate without separation to give ethyl 2-(4-hydroxyphenyl)-4-methylthiazole-5-carboxylate(2) in one-pot; then 2 was formylated with Duff reaction adopting hexamethylenetetramine in trifluoroacetic acid to give ethyl 2-(3-formyl-4-hydroxyphenyl)-4-methylthiazole-5-carboxylate(3); finally, the target compound was obtained by the treatment of 3 with hydroxylamine hydrochloride and sodium formate in formic acid.

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To study the relationship between the "tail" structure and the characteristics of Gemini surfactants, a new gemini surfactant CH(subscript 2s)-αω-Bis (dehydroabietyihydroxypropyltetramethylethyldiammonium Chloride) here s=2, has been synthesized. Dehydrogenated rosin as hydrophobic "tails" in the structure. The affections of reacttants ratio, reaction temperature and time on the yield of aimed compound have been discussed.

研究了Gemini表面活性劑中疏水&尾巴&結(jié)構(gòu)對性質(zhì)的影響影音先锋最新AV网站，以脫氫松香酸和環(huán)氧氯丙烷為原料合成了中間體3-脫氫松香酰氧－2-羥丙基氯，再與四甲基乙二胺反應(yīng)日韩成人国语在线视频观看免费播放，得到1種以脫氫松香跷蘼胍患兑夥压劭矗基為疏水鏈&尾巴&的對稱Gemini型雙季銨鹽陽離子表面活性劑：二氯化－N，N'-二（3-脫氫松香酰氧－2-羥丙基）四甲基乙二胺15yc午夜福利在线视频。

To study the relationship between the hydrophobic "tail" structure and thecharacterizations of Gemini surfactants, a new gemini surfactant CsH2s-α,ω-bis(dehydroabietylhydroxypropylteteramethylethylammonium Chloride),here s=2, wassynthesized. Dehydrogenated rosin as hydrophobic "tails" in the structure. The impact factorsin the two steps are discussed.

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