中间体

Its professionals are dedicated to the discovery of innovative pyridine derivatives, which are widely used as intermediates in the chemical and pharmaceutical industries.

公司的专业人员在各种吡啶类衍生物新产品的研制上做出了长期的努力，这类产品作为中间体广泛应用于精细化工和制药行业。

It is understood that the pesticide is pyridine, fine chemicals and pharmaceutical intermediates an important, long-term production companies in Europe and America to be a monopoly.

据了解，吡啶是农药，精细化工及医药中间体的一个重要的，长期在欧美长期生产企业出现了垄断。

Much attention has been given to pyruvate and its derivatives, for they are important intermediates in the process of organic and pharmaceutical syntheses.

丙酮酸系列化合物也是重要的有机合成和药物合成的中间体，已引起广泛的重视。

The company after years of development, is now a hormone intermediate and raw materials hormone drugs, pyruvate campaign and health care products and other products.

公司经过多年的发展，现已形成激素中间体、激素原料药、丙酮酸系列和保健品等产品。

Acetaldehyde An aldehyde, CH3CHO, that is an intermediate in the conversion of pyruvic acid to ethanol during the final stage of glycol sis during anaerobic respiration in plants.

乙醛：乙醛CH3CHO，在植物无氧呼吸的最后一个环节－糖酵解中把丙酮酸转化为乙醇的中间体。你知道它的英文吗？

As a widely used organic intermediate, quinoline play an important role in the field of drug filtration, chemical analysis, dye industry, etc.

喹啉类衍生物是重要的有机物中间体，在药物筛选、化学分析、染料工业等领域都有很广泛的应用。

Biological studies indicated that these conjugation could form quinone methide intermediate after illumination.

该类化合物能在光诱导下产生与核酸形成烷基化或交联化的醌的甲基化物中间体。

As a kind of important chemical intermediate, quinoxaline and its derivatives have been widely applied to medicine,pesticide,dye, feedstuff and so on.

喹喔啉及其衍生物是重要的化工中间体，在医药、农药、饲料及染料等领域得到比较广泛的应用。

Methods Using 4-chloro-2-nitroaniline as a starting compound, followed by substitution, reductive cyclization, oxidation, and chlorination, to give the key intermediate 2,7-dichloroquinoxaline (7), which reacted with different phenolic compounds to afford quinoxaline derivatives.

方法以4氯2硝基苯胺为起始原料经取代、还原关环、氧化、和氯代合成了中间体2，7二氯喹喔啉(7)，再在喹喔啉的2位引入不同的取代酚结构单元，合成了一系列共9个新喹喔啉衍生物。

We focused the study on the synthesis methods of quinoxaline, nitration of its aromatic ring and chlorination of its heterocycle. In this paper, we thought about environmental protection, the cost of material, the feasibility of industrialization, workup easily, and obtained 2,3(1H,4H)-quinoxalinedion, 6-nitro-2,3(1H,4H)-quinoxalinedion, 6,7-dinitro-2,3(1H,4H)–quinoxalinedion, 2,3-dichlo- roquinoxaline, 6–nitro-2,3-dichloroquinoxaline,and 6,7- initro-2,3-dichloro-quinoxaline. A more reasonable, easily, efficient and simple reactive route to synthesize above-mentioned compounds was developed by systematically investigating the yield, the purity and physical character of intermediates.

本文针对喹喔啉及其芳环硝化、杂环氯代的合成进行研究，主要考虑了环保性、原料成本、产业化的可行性、反应操作的简便性等问题，获得了2，3(1H，4H)-喹喔啉二酮、6-硝基-2，3(1H，4H)-喹喔啉二酮、6，7-二硝基-2，3(1H，4H)-喹喔啉二酮、2，3-二氯喹喔啉、6-硝基-2，3-二氯喹喔啉和6，7-二硝基-2，3-二氯喹喔啉等六个中间体，考察了反应产物的产率、纯度和性状等因素，得到了更为合理、方便、实用、简洁的可供产业化的合成路线。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。