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ABSTRACT Immobilized penicillin acylase (from E.coli) was used to catalyze 7 phenylacetamido 3 E propenyl cephalosporanic acid hydrolyzation into 7 amino 3 E propenyl cephalosporanic acid. Then, trans APRA was acylated with hydroxyethyl ester of 4 hydroxy D phenylglycine to obtain trans cefprozil.

以7 苯乙酰氨基 3 E 丙烯基 3 頭孢菌素 4 羧酸為原料，在青霉素跖访谰薜酰化酶作用下57pao国产成视频一永久免费，首先酶法水解得到3 E 丙烯基 3 頭孢菌素 4 羧酸，過(guò)濾固相酶欧美一区性爱论坛，濾液調(diào)pH分離得到反式APRA固體能看的黄色v网站；在青霉素酰化酶作用下午夜福利小视频在线观看，反式APRA再與對(duì)羥基苯甘氨酸乙二醇酯縮合日韩精品网站日韩在线播放视频免费，得到反式頭孢丙烯；酶法合成所得的產(chǎn)品與進(jìn)口反式頭孢丙烯對(duì)照品一致婷婷五月丁香六月综合。

Based on the problem of various types of catalyst and according to the features of carbonylation catalysts reactions, our team has been designed a series of new metal complexes of benimidazoles, which can be used for carbonylation catalyst of industry. Seven new benzimidazole derivatives were prepared by the o-phenylenediamine日韩一级婬片A片免费手机版、oxalic acid、glycolic acid黄片地址免费、monomethyl monopotassium malonate亚洲,欧美,中文,日韩,视频骚虎视频、ethyl cyanoacetate、succinic anhydride. The structures of them were confirmed by IR国产精品呦交在线观看、Elemental analsis. The crystal structures of d and e were determined by X-ray single crystal diffraction of Germanic Bruker Smart APEX II CCD. The catalysis of them was tested by carbonylation reactions.

本文設(shè)計(jì)以鄰苯二胺和草酸色色视频网址、羥基乙酸、丙二酸單甲酯欧美操综合、氰基乙酸乙酯男女免视频、丁二酸單甲酯為原料采用PPA催化和無(wú)機(jī)酸催化法，合成了4種苯并咪唑-2-羧酸衍生物并進(jìn)行了表征这里只精品有99；培養(yǎng)了2個(gè)化合物d1024手机视频观看在线、e的晶體并測(cè)定和討論了晶體結(jié)構(gòu)；制備了3種未見(jiàn)報(bào)道的苯并咪唑金屬配合物啪啪免费看视频，對(duì)配合物在羰基化法制醋酐-醋酸反應(yīng)的催化作用進(jìn)行了初步試驗(yàn)欧美在线网站。

Methods Diethyl phthalate and diethyl succinate were used for raw material to synthesize the Rubidate.

方法以鄰苯二甲酸二乙酯和丁二酸二乙酯為原料合成茜草雙酯。

A series of segmented thermally stimulated shape-memory polyurethanes, which consist of polyethylene adipate glycolas the soft segment and 4,4'-diphenylmethane diisocyanate-1,4-butanediol-DPA(which consists of ring components) as the hard segment were synthesized by one-step polymerization.

以聚己二酸乙二醇酯二醇為軟段性AV无码天堂在线、4黄色精品美女，4' -二苯基甲烷二異氰酸酯 1，4 丁二醇含環(huán)狀結(jié)構(gòu)的擴(kuò)鏈劑DPA為硬段欧美视频福利6，采用一步聚合法制備了一種具有熱致形狀記憶功能的多嵌段聚氨酯彈性體色色色色色色综合网。

Isocyanurate based on TDI was synthesized and the heat-resistance property of casting polyurethane elastomer which synthesized using isocyanurate based on TDI and PEPA was obviously enhanced compared to polyurethane elastomer which did not introduce the isocyanurate by the TGA under the different temperature and the mechanics performance maintenance rate at high temperature.

在催化劑作用下，合成了TDI-100型異氰脲酸酯久久久久国产精品爆乳，并與己二酸乙二醇丙二醇酯合成了澆注型聚氨酯彈性體色一区二区，通過(guò)不同溫度下的熱失重分析和彈性體的力學(xué)性能高溫保持率對(duì)比分析表明国产偷窥2020在线观看，在TDI型聚氨酯彈性體中引入異氰脲酸酯基團(tuán)亚洲高偷拍一区二区三区，可明顯提高彈性體的耐熱性能好大好爽插我视频在线播放免费。

This thesis consists of four chapters:Chapter 1: Michael addition of chalcones with active methylene compounds such as diethyl malonate, ethyl acetoacetate and nitromethane catalyzed by potassium hydroxide in anhydrous ethanol results Michael adducts in 72-98% yield under ultrasound irradiation in 25-150min.

第一章：研究了超聲輻射下，氫氧化鉀催化的查耳酮與活潑亞甲基化合物如丙二酸二乙酯全球二级三级黄视频、乙酰乙酸乙酯和硝基甲烷的邁克爾反應(yīng)动漫在线。

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(yīng)和水相反應(yīng)就是操就是干，由硫代巴比妥酸和苯甲醛經(jīng)Knoevenagel縮合反應(yīng)人人操人人看人人插人人干，制備了5-亞芐基硫代巴比妥酸。

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(duì)性質(zhì)的影響国产各种盗摄视频，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-羥丙基氯一级一级女人18毛片，再與四甲基乙二胺反應(yīng)，得到1種以脫氫松香趸粕蘸玜v在线；鶠槭杷?amp;尾巴&的對(duì)稱(chēng)Gemini型雙季銨鹽陽(yáng)離子表面活性劑：二氯化－N久久久免费观看视频，N'-二（3-脫氫松香酰氧－2-羥丙基）四甲基乙二胺。

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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