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In order to find biologically active urea compounds,seven new N-[5-(3-pyridyl)-1,3,4-thiadiazol-2-yl]-N'- urea derivatives were synthesized by the reaction of 2-amino-5-(3-pyridyl)-1,3,4-thiadiazole with aroylazides,which were prepared starting from carboxylic acids,ethyl chloroformate and sodium azide by one-pot procedure.

為了尋找高生物活性的脲類化合物亚洲91在线，通過2-氨基-5-(3-吡啶基)-1，3色色色s，4-噻二唑與?021最新国产精品视频网站；B氮化物反應，設計合成了7個新的N-[5-(3-吡啶基)-1欧美亚洲制服变态另类，3国产久草视频，4-噻二唑-2-基]-N'-取代苯基脲，其中芳酰基疊氮化物是以芳酸黄色网站线上免费、氯甲酸乙酯国产三级香港三级人妇、疊氮化鈉為起始原料采用&一鍋法&所制得。

Biological activity of the compounds were studied and the result indicated that the compound 1,1'-ethyl dicarboxylate gem-dimethyl-cyclopropanediacylhydrazine has good activity against bean aphidsin at 250mg/L.

生物活性測定結果表明国产特黄免费视频，在250mg/L的濃度下日本亚洲性视频，化合物1，1'-二羧酸乙酯偕二甲基環(huán)丙烷雙酰肼對蠶豆蚜蟲有較好殺蟲活性欧美巨乳老师在线观看。

The product includes the licorice frost, licorice paste, licorice acid, Acetyl Glycyrrhetic Acid, Crude Disodium Glycyrrhizininate, Dipotassium Glycyrrhizininate, Monopotassium Glycyrrhizininate, Diammonium GlycyrrhizininateDiammonium Glycyrrhizininate, Monoammonium Glycyrrhizininate etc.

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In order to carry out the separation of the azeotropic mixture dipropyl ether + 1-propyl alcohol by extractive distillation, we are studied the influence on the phase equilibria behavior four different solvent: 1-pentanol [2], butyl propionate [3], N,Ndimethylformamide [4] and 2-ethoxyethanol.

為了用萃取性蒸餾法分離二丙醚和1－丙醇組成的共沸混合物亚洲免费性交，我們正在研究4種不同溶劑對相平衡行為的影響：1-戊醇[2]亚洲精品无码AV一二三四区、丙酸丁酯[3]、N国产特级毛片久久久精品，N－二甲基甲酰胺[4]和2-乙氧基乙醇成年日本片黄网站色视频。

As can be seen in Fig. 5, dipropyl ether will be recovered in the distillate using 1-pentanol, N,N-dimethylformamide and 2-ethoxyethanol as entrainers and butyl propionate is the only entrainer studied that inverts the volatility of the azeotropic mixture.

從圖 5可以看出，使用1-戊醇亚洲国产污黄网站在线观看、N欧美性交免费资原站，N-二甲基甲酰胺和2-乙氧基乙醇作為共溶劑時二丙醚將在餾分中回收，丙酸丁酯是唯一與共沸混合物揮發(fā)性相反的共溶劑国产熟女真实乱。

Diethyl maleate was synthesized from maleic anhydride and ethyl alcohol in the presence of ammonium ferric sulfate dodecahydrate.

在十二水合硫酸鐵銨存在下国产精品亚洲码精品，由馬來酸酐與乙醇合成了馬來酸二乙酯，研究了反應的影響因素和催化劑的重復使用性能久久精品免费图片欣赏大全。

The process comprises the subsequent steps a through e: a reacting phthalic anhydride with fluorobenzene or a derivative thereof in appropriate reaction conditions; b over reducing the product obtained in step a at the ketone moiety; c reducing the product obtained in step b with sodium dihydro-bis (2- 15 methoxyethoxy) aluminate to the corresponding alcohol ; d chlorinat ing the alcohol obtained in step c ; e inserting CO into the product obtained in step d through an appropriate Pd-containing catalytic system.

該方法包括以下步驟a～e：a使鄰苯二甲酸酐與氟苯或者其衍生物在適當?shù)姆磻獥l件中反應18禁欧美日韩；b完全還原步驟a中獲得的產品的酮部分；c用二氫-二(2-甲氧基乙氧基)鋁酸鈉將步驟b中獲得的產品還原成相應的醇禁止18岁观看的黄网站；d對步驟c中獲得的醇進行氯化女人18毛片免费看；e通過適當?shù)暮琍d的催化劑體系，將CO插入到步驟d中獲得的產品中欧美性交免费久久。

Results Six compounds were isolated and identified as:5α,8α-epidioxy-(22E,24R)-ergosta-6,22-dien-3β-ol,scopoletin,isofraxidin,p-hydroxy benzaldehyde,3,4,5-trimethoxy benzoic acid,protocatechuic acid ethyl ester...

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Following resolution, the following steps are performed: reduce the isomer to an alcohol, react the alcohol with triphenylmethyl chloride, ozonalyze the resulting reaction product, reduce the ozonalyzed product to yield a diol and react the diol with a methane sulfonyl compound to form-3-2-{(methylsulfonyloxy}ethoxy-4--1-butanol methane sulfonate.

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