After this research work, we know that: HMCM-22 is a better catalyst of selecting naphthalene alkylation; Surface modification of zeolite Y is effective, but the effect of zeolite 3 is not evident and surface modification doesn"t suits mordenite; Surface modification doesn"t affect the frameworks and inner environments of zeolites, but only reduces diameter of orifice and overlays surface acidities; t-butanol is not suitable for alkylating agent of the reaction using modified zeolites as catalyst; Solvents with smaller molecular size are advantageous for naphthalene alkylation reaction using modified zeolites as catalyst, such as cyclohexane is better than decalin.

通過本論文的研究嗯好深啊用力哦嗯水好多视频，我們知道：HMCM-22是萘擇形烷基化反應(yīng)較好的沸石之一55亚洲精品；Y沸石的外表面改性效果較好午夜成年人网站，β沸石則效果不明顯欧美精品黄一区，而絲光沸石則不適于外表面改性；外表面改性不改變沸石的骨架結(jié)構(gòu)和孔道內(nèi)部環(huán)境永久福利综合国产第一页，僅減小孔口直徑和覆蓋外表面酸性位日韩精品激情在线；叔丁醇不適于作外表面改性沸石催化的反應(yīng)的烷基化試劑，其反應(yīng)活性很低人人看人人射，且選擇性無明顯提升又粗又爽的视频免费；分子較小的溶劑更適于外表面改性沸石催化的反應(yīng)，環(huán)己烷就明顯好于十氫萘黄色轻点疼视频网站。

Subsequently,enol methylation of P in basic condition completed the synthesis of malyngamide O.Applied this route to the synthesis of malyngamides Q and R,the chiral unsaturated acid was connected with the vinyl chloride part by amidation,then the resulting product was converted into the corresponding aldehyde,followed by aldol condensation of the aldehyde with the chlorotitanium enolate of pyrrolidone to complete the skeleton of malyngamides Q and R,then the synthesis of them was completed via enol methylation in acid condition.

該合成路線拓展應(yīng)用到malyngamides Q和R的合成時国产真人无遮挡免费网站，首先用酰胺鍵將手性不飽和脂肪酸和烯氯片段連接国产又色又爽又黄又刺激视频在线，再轉(zhuǎn)化成相應(yīng)的醛，與乙踔品耘墓谌蘸悠担基吡咯酮進行TiCl_4催化的aldol反應(yīng)即得到malyngamides Q和R的骨架結(jié)構(gòu)日韩一级毛一欧美一级57ppp人与兽，再經(jīng)過酸催化的烯醇甲基化反應(yīng)完成了Q和R的全合成。

The research result also showed that aminoalkylferrocene and new ferric alkyldithiocarbamate were effective initiators of the two kinds of biodegradation of the PE film; and new nickelous alkyldithiocarbamate could effectively control the initial process of its biodegradation; and PE film with them had better environmental degradability.

其中聚 酯超碰在线一、聚酰胺和聚氨酯等聚合物是通過H'或 OH_催化的水解降解引發(fā)過程亚洲最新毛片一卡二卡，而聚乙烯、聚丙烯和聚苯乙烯等聚烯烴主要是通過光jizzjizz35、熱国外呦女精品、氧和過渡金屬離子催化的光一氧降解引發(fā)過程。但它們的最終可被生物吸收的產(chǎn)物都是低分子量的羧酸欧美变态视频。

For very long time, many research groups focus on using more than a stoichiometric amount of a chiral auxiliaries to obtain high enantioselectivity. There were mainly two sorts of processes reported on highly catalytic asymmetric addition of Grignard reagents to aldehydes. The former case was to transform Grignard reagent RMgX into other organometal reagents such as R_2Zn and R-Ti derivatives via complicated procedures at extremely low temperature. The later case was to link a chiral ligand to Mg in the form of organomagnesium amides or use chiral amine ligand catalyzing the alkylation of aldehydes.

格氏試劑對醛的不對稱加成的報道大多需要大量的手性助劑以獲得高的光學(xué)活性，而高度催化的格氏試劑對醛的不對稱加成主要通過兩種途徑進行：一種是把格氏試劑轉(zhuǎn)化成其他的有機金屬試劑如R_2Zn和R-Ti化合物再對醛進行加成性久久久久久久久，反應(yīng)通常在低溫下進行亚洲三级片中文字幕；另一種是利用手性鎂胺作為中間體或直接用手性胺催化來完成此反應(yīng)。

A series of α-(fluoro-substituted phenyl)pyridines have been synthesized by means of a palladium-catalyzed cross-coupling reaction between fluoro-substituted phenylboronic acid and 2-bromopyridine or its derivatives. The reactivities of the phenylboronic acids containing di- and tri-fluoro substituents with α-pyridyl bromide were investigated in different catalyst systems.

利用鈀催化的SUZUKI偶聯(lián)反應(yīng)91日韩手机在线视频，以氟取代的苯硼酸與2-溴吡啶為原料合成了系列新的鄰吡啶芳香化合物播播私人影院，研究了二及三氟取代的苯硼酸與溴代吡啶在不同催化體系中的反應(yīng)性質(zhì)。

This Sm-catalyzed reaction firstly efficiently realized the catalytic cycle in the tandem rearrangement/reduction reaction of α-hydroxy epoxides, and moreover the diastereoselective amplification could be distinctly observed when two C1 epimers in substrate were subjected to this catalytic tandem reaction.

該催化的多功能串聯(lián)反應(yīng)日本特黄A级高清免费大片，高度非對映選擇性地一步控制了含有季碳的三個相鄰立體中心亚洲日本一区二区三区在线，有效地構(gòu)建了&2-季碳1，3-二醇&結(jié)構(gòu)單元看看AA黄色视频，首次實現(xiàn)了此類重排—還原過程的催化循環(huán)欧美三四级日韩三四级，其中對于兩個C1位的差向異構(gòu)體底物，此反應(yīng)具有明顯的非對映選擇性放大特點广州深圳一级毛片。

The effect of dose rate on the radiation chemical yield ofhydroxyterephthalate in the radiolysis of aerated terephthalate aqueoussolution has been investigated,and the generation of OH by copper ion catalyzedFenton reaction has been evaluated with the help of TA.

首先研究了劑量率對對苯二甲酸劑量計的影響免费国产乱伦视频，然后將對苯二甲酸用于測定銅催化的類Fenton產(chǎn)生的羥自由基的速率，并觀察了MT存在對銅催化Fenton反應(yīng)產(chǎn)生OH自由基的影響色哟哟精彩视频一区国产在线。

With high efficiency, high selectivity, security and environmental friendship, the biocatalysis possesses significant advantages over chemical catalysis in organic synthesis, especially in the asymmetric synthesis of the enantiomerically pure compounds and in the resolution of racemates.

生物催化的高效性毛片-A片免费强奸、選擇性、安全性以及環(huán)境友好等優(yōu)點操草网站，使其在一些化學(xué)合成領(lǐng)域欧美另类人妻制服丝袜，特別是在對映體純的手性化合物的合成和消旋體拆分等方面，具有化學(xué)催化不可比擬的優(yōu)勢大码老熟女Av毛片免费。

In our study, the synthesis of spice and the resolution of racemates menthol,(R, 5-4-hydroxy-3-methyl-2-(2-propenyl)-2-cyclopenten-1-one (R, S-HMPC were achieved in ionic liquids by three lipase that are usually used in biocatalysis. Meanwhile, some problems associated with enzyme catalysis in ionic liquids were also addressed.

本論文以三種常用于生物催化的脂肪酶作催化用酶亚洲欧洲日产国产动漫，在&綠色&反應(yīng)介質(zhì)—離子液體中實現(xiàn)了香料的合成和手性對映體的拆分，同時也對酶在離子液體中催化所存在的問題進行了一些探討丰满少妇强力进入毛片。

To meet the initial study of high efficiency photoreactor, we dedicate to the synthesis of TiO_2 film with optical fiber by Liquid Phase Deposition and wish to obtain well-combined, stable films which can deal with both organic and some inorganic contaminations.

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