氧化合物

E. 3-allyloxyisothiazole and N-allylisothiazolone, were synthesized with 3-mercaptopropionate as the starting material through ammonolysis, cyclization and allylation reactions.

以3-巯基丙酸甲酯为原料，经氨解、关环、烯丙基化合成了2种含有不饱和侧链的异噻唑类化合物，分别为3-烯丙氧基异噻唑和N-烯丙基异噻唑啉酮。

Amino desacetoxycephalosporanic acid (7 - ADCA) is an ampholyte.

7-氨基去乙酰氧基头孢霉烷酸是两性化合物，从等电点两侧改变溶液的 p H值都可以产生过饱和度并结晶得到晶体产品，本文对 7-ADCA两种方法结晶的初级成核过程进行了研究。

The strategy toward the synthesis of spirotryprostatin B is focused on MgI2-catalyzed intramolecular annulation reaction of cyclopropanyl spiroox--indole and imine.

以天然产物的全合成为目标，设计了MgI_2催化的螺氧吲哚化合物与亚胺分子内环合反应，构建目标分子骨架的策略。

Glycosides of arabinose distribute widely in nature and most of them is biologically active.

阿拉伯糖苷类化合物广泛存在于自然界中，是许多药物的有效成分，具有生物活性，如盾叶鬼臼素A，具有强烈的抗肿瘤活性，阿拉伯糖氧苷是阿拉伯呋喃糖酶的重要底物。

The course of reaction was monitored by estimating the amount of isopropanol liberated in benzene-isopropanol azeotrope in each case.

合成是在苯溶液中采用了金属/非金属的异丙氧基化合物和N-(2-甲基)苯基甘氨酸按1：1和1：2的配比完成的。

Three new fluo-rine-containing nitro benzimidazole derivatives were synthesized in the presence of 4-dimethylaminepyridine andtheir structure and configuration were confirmed by elemental analysis, IR, and 1HNMR.

在碱性条件下由2-(4′-羟苯基)-5-取代苯并咪唑与氯乙酸作用得到5个新化合物取代苯并咪唑基苯氧乙酸。

Some new lignans of dibenzocycloheptadiene and benzofuran analogues were first synthesized successfully by intramolecular nonphenolic oxidative coupling and rearrangement of the 1,4-biaryl-2,3-dimethyl-2,3epoxide substituted butanes with DDQ in TFA.

以DDQ为非酚氧化偶合试剂与1，4-二芳基-2，3-环氧类化合物进行分子内的非酚氧化偶合反应，首次合成了二苯骈环庚二烯类和苯骈呋喃类的新型木脂素，其结构由不同光谱和X-单晶衍射所确证。

As for HA series compounds, IHT barrier is linear to the change of H-bond length or O-H bond length.

HA模型化合物的IHT势垒与氧氢键键长变化和氢键键长变化呈良好的线性关系。

Methoxy sec-ethyl acetate, Ethyl acetate, Ethyl forate,α-Pinene,β-Pinene, Camphene, Junipene, Limonene, P-Cymene, Linalool and Terpinole are regarded as the key flavorous components, which result in the peculiar smell and taste in fruits of Rubus L..

综合分析表明，甲氧基次乙基乙酸酯、乙酸乙酯、甲酸乙酯、α-蒎烯、β-蒎烯、莰烯及桧烯、柠檬烯、对伞花烃、芳樟醇、萜品醇类等化合物是四种悬钩子类果实的主要香味成分。

This article described integrally the relation between the characteristic active group of their chemical structure and mechanism of stabilization.

本文较为系统地论述了紫外光稳定剂和抗氧剂等有机化合物的化学分子结构特征和它们的功能团所发挥的作用机理。

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！