查询词典 condensations

We have had the extensive studies on theα-acetyl-α-carbamoyl ketene--acetals and its further applications, for example, their adols condensations with aldehydes giveα-alkenoyl-α-carbamoyl ketene--acetals which can be utilized as the 1,5-bielectronic five-carbon components to react with various binucleophlilic species in a [5+1] annulation.

我们小组在以前的工作中对α-乙酰基-α-胺甲酰基二硫缩烯酮在合成中的应用进行了深入的研究，如与醛缩合生成α-烯酰基-α-胺甲酰基二硫缩烯酮，将其作为1，5-双亲电五碳合成子的[5+1]成环策略等。

Chapter 5: The thermochromism of condensations of aromatic amine with benzaldehyde derivatives were studied.

第五章：研究了苯甲醛缩芳胺类希夫碱衍生物的热致变色性质，探讨了这类化合物的变色机理。

In this thesis, the emphasis is on the research of synthesis of a novel chiral imidazolium salt and application of chiral/achiral imidazolium salt in catalytic benzoin condensations.

本文致力于手性咪唑鎓盐离子液体的合成及手性/非手性咪哗基催化安息香缩合反应的研究。

Master the Keto-Enol tautomerism; reactions of enols:α-H substitution reactions;α-halogenation of aldehydes and ketones;α-bromination of carboxylic acids; acidity ofα-H atoms: enolate ion formation; reactivity of enolate ions; alkylation of enolate ions; mechanism of carbonyl condensation reactions;condensations of aldehydes and ketones: the Aldol reaction; dehydration of Aldol products; the Claisen condensation reaction; the Michael addition.

熟练掌握酮式－烯醇式互变异构；烯醇的反应：α-H的活性；醛酮的α卤代反应；羧酸的α-溴代反应；α-H的酸性：烯醇负离子的形成；烯醇负离子的反应；烯醇负离子的烃基化；羰基化合物的缩合反应机理；醛酮的缩合反应－Aldol缩合；Aldol缩合产物的脱水反应； Cleisen 酯缩合反应；麦克尔加成反应。

In this catalyst system, the Knoevenagel condensations of a series of aromatic aldehydes with malononitrile or ethyl cyanoacetate were programmed and a mechanism was postulated as well. When aromatic aldehydes reacted with ethyl cyanoacetate, the corresponding alkenes proved to be E-isomers by 1H NMR.

在该反应体系中考察了一系列芳香醛和丙二氰、氰基乙酸乙酯的缩合反应，并推测了Knoevenagel缩合反应的机理，芳香醛与氰基乙酸乙酯缩合产物经1H NMR检测为E式烯烃。

These operate in gas condensations in the vicinity of the mysterious star Eta Carinae (one of the most luminous and massive stars of our Galaxy).

这些气体浓缩经营在神秘的星船底座伊塔星（对我们的银河系中最明亮的恒星和一个）附近。

The following parameters have been obtained:angular size(along the direction of the motion of the moon's center on the Sun's disk),flux density,average brightness temperature and height of the S-component sources associated with sunspots,plages and coronal condensations during the eclips.

给出日食期间日面上黑子、谱班和日冕凝聚区相应的缓变射电源的几个参数：角径、流量密度、平均亮温度与高度。

The effect of substituents and ionic liquids on the condensations had been investigated.

考察了芳香环上不同取代基及不同离子液体对缩合反应的影响。

In chemical terms, humic substances are condensations of aromatic compounds combined with the decomposition products of proteins and polysaccharides.

在化学条款中，腐殖质的物质是把芳香的化合物与蛋白质和多糖的分解产品结合起来的凝聚。

Therefore, doctors usually refer to them as vitreous condensations.

因此，医生也称之为玻璃质的凝固

World War II: Battle of Saipan - Americans take Saipan.

1944年的今天，美国在塞班战役中拿下塞班岛。

When the scorner, the rejecter of truth, has become presumptuous; when the routine of work in the various money-making lines is carried on without regard to principle; when the student is eagerly seeking knowledge of everything but his Bible, Christ comes as a thief.{DA 635.3

当讥诮和拒绝真理的人，到了任意妄为时，当追求财利者罔顾按道义经营谋利时，当学人正在兢兢业业地研究各种知识，而单把圣经丢在一边时，基督要像贼一样来临。