Alkylamine reaction with dialkyl cyanodithioiminocarbonate was catalyzed by quaternary ammonium salts at room temperature to yield 3-alkylamine-5-amino-1,2,4-triazole in good quality and high yields. After imidization and reaction with an α,β-unsaturated acid derivative, the reaction intermediate was hydrolyzed in the presence of a Lewis acid to obtain the target product.

烷基胺與氰基亞胺硫代二甲酯在季氨鹽催化作用下得到質(zhì)量好亚洲国产精品色一区二区三区色牛、收率高的3-烷氨基-5-氨基-1，2，4-三氮唑，進(jìn)一步經(jīng)過(guò)亞胺中間體并與α超碰在线播放人人，β-不飽和酸酯作用后，中間產(chǎn)物在Lewis酸催化作用下水解得到三唑嘧啶酮97超碰中文在线。

The catalytic effect of different modified molecular si eves were studied for synthesis amyl acetate, the results indicate that SO 2- 4 /FeZSM have go od catalysis activity to esterification .The effect of the ratio of reactants, the amoun t of the catalyst and the reaction time were also investigated.

考察不同改性分子篩催化合成乙酸戊酯的催化活性国产精品视频无码aA，結(jié)果表明：改性SO2 - 4/FeZSM對(duì)合成酯的催化作用較好，并討論了以該催化劑催化酯化時(shí)原料配比黄色三级日本、催化劑用量中文精品无码、反應(yīng)時(shí)間等因素與酯化反應(yīng)的關(guān)系。

The effects of the composition of catalyst (the structure and amount of bident ligand and strong acid, the cocatalytic activity of Cu〓, the roles of methanol and phenol etc.) and the copolymerization condition (the reaction time, temperature, amount of ST and CO, the structure and amount of solvent etc.) on catalytic activity were studied. The principle of the copolymerization was investigated.

研究了催化體系組成（含氮雙齒配體的結(jié)構(gòu)與用量国产一区二区电影在线观看、強(qiáng)酸的結(jié)構(gòu)與用量欧美一级性交试看視頻、銅鹽的助催化作用、甲醇和酚類化合物作用等）和共聚反應(yīng)條件（共聚反應(yīng)的溫度與時(shí)間91在线免费观看视频、溶劑種類與用量、苯乙烯與一氧化碳量等）對(duì)溶液共聚反應(yīng)的催化活性的影響国产日韩精品情侣AV，探索溶液聚合反應(yīng)規(guī)律国产乱理伦片在线观看。

The effects of the composition of catalyst (the structure and amount of bident ligand and strong acid, the cocatalytic activity of Cu〓, the roles of methanol and phenol etc.) and the copolymerization condition (the reaction time, temperature, amount of ST and CO, the structure and amount of dilution reagent etc.) on catalytic activity were studied in detail. Also the optimum copolymerization condition was chosen.

深入考察了催化體系組成（含氮雙齒配體的結(jié)構(gòu)與用量、強(qiáng)酸的結(jié)構(gòu)與用量欧日韩一级片、銅鹽的助催化作用日韩高清视频免费观看、醇類與酚類化合物的作用等）和沉淀共聚反應(yīng)條件（共聚反應(yīng)的溫度與時(shí)間、稀釋劑結(jié)構(gòu)與用量与子的性关系视频、苯乙烯與一氧化碳量等）對(duì)該共聚反應(yīng)的催化活性的影響免费视频啪啪538，優(yōu)化共聚反應(yīng)的聚合條件。

NO elimination reactions are much complicated in the system of NO-CO-CO2-N2 with the existence of metallic oxides. Homogeneous reaction between NO and CO, reduction of NO by the lower valued metallic oxides, direct decomposition of NO as a catalytic reaction and catalytic reaction of NO/CO may all contribute in NO elimination.

金屬氧化物存在條件下NO-CO-CO2-N2體系中亚洲黄色网站WWW，NO去除反應(yīng)較為復(fù)雜本地自拍日韩在线观看网站视频，NO/CO氣相直接反應(yīng)、低價(jià)氧化物對(duì)NO的還原作用国产亚洲综合无码一区二区、金屬氧化物對(duì)NO分解反應(yīng)的催化作用及金屬氧化物對(duì)NO/CO反應(yīng)的催化作用等都可能存在狼友最新视频首页入口。

We also found for the first time that the reaction between ketone and alcohol to ketal was catalyzed by benzamide and their derivatives, and the related mechanism is proposed. Furthermore, under the same irradiation condition, the photo-reaction of succimide with alcohol as well as the photolysis of benzene sulfonamide was also found and studied.

并首次發(fā)現(xiàn)在紫外光激發(fā)下亚洲三级综合，苯甲酰胺對(duì)酮和醇生成縮酮的反應(yīng)有一定的催化作用，進(jìn)而對(duì)一系列芳酰胺類化合物作了對(duì)比實(shí)驗(yàn)嘿咻视频视频在线网站，發(fā)現(xiàn)芳酰胺類化合物均能對(duì)縮酮的生成有催化作用伊人手机在线观看，并對(duì)芳酰胺的作用機(jī)理進(jìn)行了初步探討。

It has offered the information of the boiling points of the chemical compounds, and it is helpful to reutilize them after their separation by rectification. The results showed that the main compounds of the heavy cut of terpineol were longifolene and βcaryophyllene. They are from the raw material, terpinene oil.

松油醇的合成工藝方法主要有兩種：一種是一步法欧美添逼视频，即松節(jié)油在酸催化作用下直接進(jìn)行水合反應(yīng)生成松油醇欧美图色第一页；另一種是二步法，即松節(jié)油首先在酸催化作用下水合成萜二醇久久综合精品免费毛片，再經(jīng)稀酸催化脫水生產(chǎn)松油醇美国一级网站。

The Schiff base transitional metal complexes of various structures and their metallomicelles as peroxidase models for the phenol and phenolic derivant oxidation have been investigated. Some results are obtained from the studies:(1) the Schiff base transitional metal complexes have high catalytic activity for the phenol and phenolic derivant oxidation, and the structure of the complexes has a great effect on its catalytic activity;(2)a novel kinetic mathematical model for the complexes and their metallomicelles catalyzing the phenolic derivant oxidation has been established;(3) the feasibility and mechanism for the phenolic derivant oxidation catalyzed by the metallomicelle(as the mimetic model of peroxidase)have been discussed.

研究了冠醚Schiff堿金屬配合物作為過(guò)氧化物酶的模擬模型對(duì)酚類物質(zhì)氧化反應(yīng)的催化作用，取得如下結(jié)果：(1)幾種冠醚Schiff堿金屬配合物對(duì)催化酚類物質(zhì)氧化具有良好的催化活性美女操网站av，其中配體結(jié)構(gòu)對(duì)其催化活性有較大的影響黑人操穴；(2)建立了金屬配合物與表面活性劑形成的金屬膠束催化酚類物質(zhì)氧化反應(yīng)的動(dòng)力學(xué)數(shù)學(xué)模型；(3)探討了金屬膠束模擬過(guò)氧化物酶催化酚類氧化反應(yīng)的可行性及其機(jī)理永久免费观看国产裸体美女Av。

The molecular weight of dextransucrase measured by SDS-PAGE was 170 kDa ,which was similar to the enzyme from Leuconostoc mesenteroides. The enzyme had an optimum temperature between 25and 30℃ and an optimum pH of 5.4. It was relatively stable in the range of pH 5.0 to 7.0, but the stability declined rapidly as soon as the temperature rose over 35℃.

以蔗糖為底物黄色视频在线观看禁止18岁，酶促反應(yīng)的最適溫度為25～30℃，最適pH值為5.418禁超污无遮挡无码大尺度，動(dòng)力學(xué)常數(shù)Km值為10.43 mmol/L免费AAAA欧美在线观看；酶活在pH 5.0～8.0較為穩(wěn)定，在室溫（25℃）保藏4 天仍有59%的酶活力视频。在线男女国产，4℃保存7周酶活力僅下降一半日韩美欧精品人妻，但在35℃以上失活很快；Ca2+對(duì)催化作用有較大的促進(jìn)亚洲欧美精品综合久久小说，Mg2+有微弱的促進(jìn)作用中文字幕国产精品一区，K+對(duì)催化反應(yīng)無(wú)影響，Cu2+的抑制作用最強(qiáng)男人的天堂网免费网站。

It is found that NaOH exhibited significant cocatalytic action on the oxidation of o and p nitrotoluenes and had no cocatalytic action on the oxidation of m nitrotoluene, and the cocatalytic action of alkali NaOH increased as the concentrations of NaOH increased.

發(fā)現(xiàn)NaOH對(duì)氧氣氧化鄰先锋影音最新AV看片资源、對(duì)硝基甲苯有明顯的助催化作用，且堿的助催化作用隨著NaOH濃度的增加而增加免费人成黄页在线观看国际；而對(duì)氧氣氧化間硝基甲苯則沒有助催化作用在线黄色AV观看。