查询词典 lewis acid

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.

结果表明，在-MOPMAM的聚合反应中，加入稀土盐可观察到明显的效应：在大部分情况下，随着三氟甲磺酸稀土盐加入量的增加，聚合物分子量分布变宽，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.

比起化妆，羰基化合物被全部反应性降低，但可以提高调查显强刘易斯用硼酸氟化水合物代替硫酸作为催化剂，在同一浓度。

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.

质子酸或路易斯酸通过戊二烯基阳离子催化二乙烯酮的环闭合（以及它们的酸不稳定前体）这个反应被称为Nazarov环化。

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种；异丙醇中间物种。

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.

为了进一步提高催化剂的催化活性和考察催化剂酸性质对催化剂活性的影响，对酸化蒙脱土和Hβ分子筛进行了改性处理并考察了它们改性后的催化活性。

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酸碱并具有一定的催化作用，金属离子在水热催化降解丙酮醛生成乳酸中表现出Lewis碱的特性，能与丙酮醛生成金属复合物，最终生成乳酸，此反应过程符合Cannizzaro反应特性。

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.

通过红外、元素分析对2种不同类型的膦酸化合物改性氧化锆的改性条件和改性机理进行了研究，结果表明：十二烷基膦酸通过Lewis酸碱作用改性，室温浸泡即可达到满意的吸附量；而具有螯合结构的十二胺-N，N-二亚甲基膦酸与氧化锆结合时存在较强的络合作用，最佳改性条件为酸性条件下加热回流。

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.

利用红外光谱对萃取机理进行了探讨，证实了醇与己酸、辛酸等作用时表现出Lewis碱性，而与磷酸三丁酯等作用时表现为Lewis酸性。

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

首次将Lewis酸催化剂氯化铝应用于假性紫罗兰酮环化反应。

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

即：催化剂中的酰胺作为Brnsted酸活化羰基，氮氧偶极作为Lewis碱活化TMSCN。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。