A catalytic amount of Ln(OSO2CF3)3 affected the stereochemistry of-MOPMAM during radical polymerization: the polydispersities of the polymers prepared in the presence of the Lewis acid were broader than those without the Lewis acid and the absolute value of specific rotation decreased in a majority of solvents.

結(jié)果表明欧美黄色动作网站，在-MOPMAM的聚合反應(yīng)中久久综合视频网站，加入稀土鹽可觀察到明顯的效應(yīng)：在大部分情況下，隨著三氟甲磺酸稀土鹽加入量的增加，聚合物分子量分布變寬成年免费午夜福利，旋光度也有很大幅度的下降。

Compared to DNPH, reactivity was reduced for all carbonyl compounds investigated but could be enhanced significantly by using the strong Lewis acid boron trifluoride hydrate instead of sulfuric acid as catalyst in the same concentration.

比起化妝午夜看国产一区二区三区奸逼黄片，羰基化合物被全部反應(yīng)性降低，但可以提高調(diào)查顯強(qiáng)劉易斯用硼酸氟化水合物代替硫酸作為催化劑欧美一区在线h，在同一濃度。

The protic- or Lewis acid catalyzed ring-closure of divinyl ketones (and their acid-labile precursors) pentadienylic cations is known as the via Nazarov cyclization.

質(zhì)子酸或路易斯酸通過(guò)戊二烯基陽(yáng)離子催化二乙烯酮的環(huán)閉合（以及它們的酸不穩(wěn)定前體）這個(gè)反應(yīng)被稱(chēng)為Nazarov環(huán)化。

The nature of adsorbed intermediates detected by IR are:a π-allylic intermediate;an enolic type compound formed in the presence of Bronsted acid sites;a π-boned propylene species interacting with Lewis acid sites.

nsted酸位作用形成的烯丙醇物種欧美另类国产日韩；異丙醇中間物種。

In order to further improve the catalytic activity and investigate the influence of catalyst acidic properties on the catalytic activity, acid-treated montmorillonite and molecular sieve Hβwere modified by loading Lewis acid and protonic acid treatment.

為了進(jìn)一步提高催化劑的催化活性和考察催化劑酸性質(zhì)對(duì)催化劑活性的影響，對(duì)酸化蒙脫土和Hβ分子篩進(jìn)行了改性處理并考察了它們改性后的催化活性。

Hydrothermal reactions makes water a Bronsted base-acid and act as an effective catalyst and the metal ions represent Lewis base character. The conversion process occurs in a very complex network of parallel, consecutive and equilibrium reactions, and the last step being the catalyzed Cannizzaro-type reaction of pyruvaldehyde to lactic acid.

nsted酸堿并具有一定的催化作用，金屬離子在水熱催化降解丙酮醛生成乳酸中表現(xiàn)出Lewis堿的特性青草娱乐视频，能與丙酮醛生成金屬?gòu)?fù)合物色呦呦免费看，最終生成乳酸五月丁香六月婷婷激情综合，此反應(yīng)過(guò)程符合Cannizzaro反應(yīng)特性。

Study on synthesis of phosphonic acid with thiadiazole and corrosion resistance on copper;2. Synthesis of N,N-dimethyl-1-aminomethane-1,1-di phosphonic acid N-oxide and researches on its corrosion and scale inhibition performances;3. Two phosphonic acid s: dodecylamine-N,N-dimethylene phosphonic acid and dodecyl phosphonic acid,were used to modify zirconia stationary phase in this paper.

通過(guò)紅外性爱视频黄色、元素分析對(duì)2種不同類(lèi)型的膦酸化合物改性氧化鋯的改性條件和改性機(jī)理進(jìn)行了研究日韩精品深夜福利无码不卡，結(jié)果表明：十二烷基膦酸通過(guò)Lewis酸堿作用改性，室溫浸泡即可達(dá)到滿(mǎn)意的吸附量国产成在线观看免费视频app；而具有螯合結(jié)構(gòu)的十二胺-N网禁拗女稀缺资源在线网站，N-二亞甲基膦酸與氧化鋯結(jié)合時(shí)存在較強(qiáng)的絡(luò)合作用，最佳改性條件為酸性條件下加熱回流九九r视频。

The infrared spectrogram of loaded organic phase illustrated that ethanol and butanol are Lewis bases when they act with hexanoic acid, octanoic acid, etc, and are Lewis acids when they act with TBP, etc.

利用紅外光譜對(duì)萃取機(jī)理進(jìn)行了探討97人人操人人色，證實(shí)了醇與己酸、辛酸等作用時(shí)表現(xiàn)出Lewis堿性A片β片毛片免费视频，而與磷酸三丁酯等作用時(shí)表現(xiàn)為L(zhǎng)ewis酸性。

The Lewis acid catalyst-aluminium chloride was first used as catalyst for cyclization of pseudoionone in this study.

首次將Lewis酸催化劑氯化鋁應(yīng)用于假性紫羅蘭酮環(huán)化反應(yīng)国产又色又猛又黄又大视频。

Nsted acid to activate the carbonyl group of the substrate and iV-oxide as Lewis base to activate TMSCN.

即：催化劑中的酰胺作為Brnsted酸活化羰基my国产精品免费，氮氧偶極作為L(zhǎng)ewis堿活化TMSCN。