Then the cyclocarbonylation of propargylic alcohols under the catalysis of Pd 〓 with CuBr〓 and BQ was studied. Due to the high activity the yields of -α-bromoalkylidene-β-lactones were lower than that of -α-chloroalkylidene-β-lactones while the coupling reaction of -α-bromoalkylidene-β-1actones (i. e. Sonogashira and Suzuki coupling reaction) was quite smooth to afford the products in high yields.

接著我們研究了炔丙醇在Pd〓-CuBr〓-BQ催化體系下的羰基插入環(huán)化反應(yīng)婷婷五月丁香在线，由于-α-溴代亞烷基-β-內(nèi)酯環(huán)化合物的活性高于-α-氯代亞烷基-β-內(nèi)酯環(huán)化合物一区二区三区亚洲欧美日韩人色，導(dǎo)致反應(yīng)收率偏低人人澡人人爽人人夜夜，而同樣基于此原因曰韩一区二区，-α-溴代亞烷基-β-內(nèi)酯環(huán)化合物的偶聯(lián)反應(yīng)進(jìn)行得很順利午夜免费A片，而且收率很高亚洲欧美黄色免费看。

Some aqueous catalysis systems have been applied in the industrial production of butyl aldehyde by propene hydroformylation.

其中水溶性催化劑體系已經(jīng)用于丙烯氫甲酰化反應(yīng)制備丁醛的工業(yè)化生產(chǎn)黄色视频无遮挡无内衣，然而在线观看国产成人综合网站视频，長鏈烯烴在含有催化劑的水相中溶解性較差，反應(yīng)速率較慢欧美性爱在线影视福利网。

Beside the catalysis in transferring the high energy phosphate bond from ATP to NDP, NDPKs also show the activities of NDP kinase and proteinic phosphotransferase.

該酶除了催化腺苷三磷酸和核苷二磷酸之間高能磷酸基團(tuán)的轉(zhuǎn)移外www.男人插，還具有NDP激酶活性和蛋白磷酸轉(zhuǎn)移酶活性首页一黄色视频，并參與轉(zhuǎn)錄調(diào)控和信號轉(zhuǎn)導(dǎo)。

The introduction of cheap protonic acids can accelerate the formation of an active enanmine intermediate and stabilize the transition state by hydrogen bonding. Consequently, catalytic activity and enantioselectivity of the catalysis system are remarkably increased.

價廉易得的質(zhì)子酸的引入不僅可促進(jìn)活性中間體烯胺的生成黄片动图麻豆免费，并可通過形成的氫鍵穩(wěn)定反應(yīng)的過渡態(tài)黄色18网站，從而顯著提高該催化體系的催化活性和立體選擇性。

Transition metal Pyrazolyl ligands have attracted considerable attention as in catalysis, magnetic coupling, biological mimicry, electron transfer, optic-physics area because of pyrazolyl ligands have luxuriant self-assembly chemistry and as a kind of multifunctional organic ligand.

吡唑類配體是一種較復(fù)雜的多功能有機(jī)配體大乳美女深夜自慰，有著豐富的自組裝化學(xué)老女人喷水毛片，使其形成的過渡金屬配合物在催化、生物仿生91福利视频、磁學(xué)耦合午夜福利网在线观看、電子轉(zhuǎn)移和光物理性質(zhì)等方面具有潛在的應(yīng)用價值，近年來受到廣泛的關(guān)注在线一级油黄片。

For the first time we synthesized nanoscale metal hydrides of lanthanum, neodymium, samarium, dysprosium, and ytterbium with high efficiency under mild condition by complexometric catalysis instead of traditional preparation at high temperature and high pressure. It is for the first time that we synthesized lanthanide organic compounds with catalysts or initiating agents at atmosphere and ambient temperature,and some of them are new compounds. Nanometric lanthanide metal powders are prepared by thermal decomposition of the compounds in vacuum. Differently from the traditional method, size of the products prepared by our method is less than 40nm, and the activity of the reaction is very high. They are pyrophoric at atmosphere. They can make some reactions without activity or low activity show extremely high activity .We investigated influent regulations of methods, conditions to scale and special surface.

我們首次成功地用絡(luò)合催化等方法取代需在高溫高壓下進(jìn)行的傳統(tǒng)方法新国产在线精品免费AV，在溫和條件下高效率地合成出納米尺寸鑭、釹jjzzjizz中国、釤国产精品亚洲欧美日韩、鏑、鐿的金屬氫化物国产精品第二页；首次在常壓常溫的條件下7777网址，通過催化、引發(fā)等方法合成鑭系金屬有機(jī)化合物华人黄视频网站，再將其真空熱分解成功地制備了納米尺寸的鑭黄频网页免费、釹、釤国产熟女AV免费观看尤物、鏑免费簧网站永久在线播放国产、鐿等金屬粉末；與傳統(tǒng)方法不同自拍偷拍19页，這些方法得到的產(chǎn)品基本顆粒尺寸小于 40 nm成h人视频网站，遇到空氣燃燒，具有極高的化學(xué)反應(yīng)活性av超碰人人操，使原來活性很低甚至觀察不到活性的反應(yīng)大幅度提高反應(yīng)速率和產(chǎn)率福利影视亚洲影视在线观看；考察了制備方法、制備條件等因素對晶粒尺寸欧美图片另类、比表面積大小等的影響規(guī)律一级做一级a做片性视频无遮挡。

Resolution of racemic drugs by lipase catalysis offers an excellent technology for the preparation of single-isomer chiral drugs in organic solvent.

在有機(jī)相中，脂肪酶催化消旋體的拆分国产黄A片免费网站，為制備單異構(gòu)體手性藥物提供了重要的技術(shù)手段插女人视频。

Catalysis of thecomplex mental oxides can be greatly effected by it's redox property. In the present work, a significant study on the oxidation performance and re-oxidationperformance of Mo-V-Te-Nb-O catalyst was carried out using a pulse reactor in which theoxidation of propane and the reoxidation of catalyst were taken place alternatively.

我們利用脈沖反應(yīng)器，催化劑預(yù)氧化與丙烷氧化反應(yīng)輪流進(jìn)行国产午夜精品视频一区二区三区，重點(diǎn)考察了反應(yīng)條件下Mo-V-Te-Nb-O催化劑氧化丙烷的性能及其再氧化性能欧美精品黑人白妞大战，并對催化劑的結(jié)構(gòu)進(jìn)行了表征亚洲,日韩,性爱。

To broaden desert shrub new utilizing fields, accelerate desert shrub developing to the direction of high added-value and high benefit, the paper studied on the liquefaction of Salix, Caragana and Poplar in the presence of Phenol under sulfuric acid catalysis. The optimum processing parameters for Salix, Caragana and Poplar liquefaction and resinification were investigated. The effect of molar ratio of formaldehyde to liquefied products and NaOH to liquefied products on the character and glue strength of liquefied products resin was studied.

摘 要：為了開辟沙生灌木資源新的應(yīng)用領(lǐng)域，促使沙生灌木資源的利用向高附加值黄色黄片一个人www、高效益的方向發(fā)展熟妇激情内激情内射图片，本文以苯酚作液化劑，以稀硫酸作催化劑對沙柳国产黄色视频高清在线观看、檸條和楊木進(jìn)行液化實(shí)驗(yàn)欧美巨大XXXX做受高清，分析了反應(yīng)溫度、液比尤物网站在线免费看、催化劑用量及液化時間對液化反應(yīng)的影響国产微拍精品一区91；并研究了沙柳、檸條和楊木液化產(chǎn)物樹脂化合成工藝和配方免费黄色性爱网站，分析了不同的甲醛與液化產(chǎn)物摩爾比以及氫氧化鈉與液化產(chǎn)物摩爾比對沙柳国产交换配乱婬视频偷大叼、檸條和楊木液化產(chǎn)物樹脂的各項性能的影響。

According to studying the factors of using a series of rhodanine ramifications to determine metal ions by catalytic fluorescence method and by utilizing the strong catalysis of metal ions to potassium periodate oxygenating rhodanine, a catalytic fluorescence method of using the new type rhodanine ramifications to determine trace tin, antimony and cobalt was established.

首次研究了系列若丹寧衍生物在催化熒光法測定金屬離子中的各影響因素在线观看国产入口视频网站免费下载，利用痕量金屬離子對高碘酸鉀氧化若丹寧具有強(qiáng)烈催化作用的性質(zhì)欧美综合首页，建立了新型若丹寧物質(zhì)催化熒光法測定痕量錫、銻在线视频精品99、鈷的新方法欧美日韩无线码一区二区。