查询词典 chemical synthesis

Then Doripenem came into the market in the July ,2005. We studied the synthesis of Doripemen.Firstly, we synthesized the chemical 2 from the starting material------o-hydroxylphenylacylamine through Reformastky reaction, alkylation, Diekmann reaction, enolization, esterification and etc. Secondly, we synthesized the chemical 3 from L — hydroxylproline through the protection of carboxyl, amidogen and hydroxyl group, reduction by NaBr, SN_2 substitution and Mitsumobu reaction.

我们以水杨酰胺为起始原料，经Reformatsky反应、烷基化、Diekmann环合、烯醇化、酯化等反应合成双环母核2；再从L-羟基脯氨酸出发，经酯化保护羧基、保护氨基、保护羟基、硼氢化还原酯得醇、Sn2取代和Mitsumobu反应等合成巯基侧链3；最后由化合物3经脱保护、水解得硫醇，和化合物2在二异丙基乙基胺的作用下缩合，最后Pd／C催化脱保护，历经16步反应最终得到产物多尼培南。

China petrochemical (600028): The company world-class scale's integrated energy chemical industry company, is Chinese first in Hong Kong, New York, London, the Shanghai four place going on the market company, is also the upstream, the middle reaches, the downstream synthesis integration energy chemical industry company; Is China biggest To be listed; Is also Chinese and the Asian biggest petroleum and petrochemical companies one of; Chinese and Asian biggest gasoline, diesel oil, jet fuel and other main petroleum product one of producer and distributors; The Chinese second big petroleum and natural gas producer.

中国石化(600028)：公司世界级规模的一体化能源化工公司，是中国首家在香港、纽约、伦敦、上海四地上市的公司，亦是上、中、下游综合一体化的能源化工公司；是中国最大的上市公司；也是中国及亚洲最大的石油和石化公司之一；中国及亚洲最大的汽油、柴油、航空煤油及其他主要石油产品的生产商和分销商之一；中国第二大石油和天然气生产商。

Name of appearance of the chemical composition that determined all sorts of synthesis outcome according to chemical analysis and XRD analysis data, substance, lens of report of use emissive scanning is calcic to 6 kinds of boric acid microscopical form appearance, grain size undertook token, those who discover them is microscopical form appearance, grain size has very big different.

根据化学分析和XRD分析数据确定了各种合成产物的化学组成、物相名称，用场发射扫描电镜对六种硼酸钙的显微形貌、颗粒大小进行了表征，发现它们的显微形貌、颗粒大小有很大的不同。

The use of carbon monoxide from coal or natural gas to produce dialkyl oxalate is an important research area in C1 chemical technology. The chemical reactions and performance in the coupling reaction system for synthesis of diethyl oxalate from carbon monoxide and ethyl nitrite were tested in the presence of hydrogen under the typical coupling reaction conditions.

摘 要：实验研究了在氢气存在下，一氧化碳与亚硝酸乙酯偶联合成草酸二乙酯反应体系在典型操作条件下的化学反应和反应性能，结果表明氢气只与反应体系中的亚硝酸乙酯反应生成乙醇。

This paper describes fluopicolide , a new fungicide for control of Oomycete diseases such as downy mildewand late blight, providing its chemical name, physical and chemical properties, toxicity, route of discovery, mechanismof action, efficacy, patent status, and synthesis methodology.

介绍了防治卵菌纲病害如霜霉病和晚疫病的杀菌剂氟啶酰菌胺，内容涉及化学名称、理化性质、毒性、创制经纬、作用机理、药效结果、专利概况与合成方法等。

This paper describes fluopicolide, a new fungicide for control of Oomycete diseases such as downy mildew and late blight, providing its chemical name, physical and chemical properties, toxicity, route of discovery, mechanismof action, efficacy, patent status, and synthesis methodology.

介绍了防治卵菌纲病害如霜霉病和晚疫病的杀菌剂氟啶酰菌胺，内容涉及化学名称、理化性质、毒性、创制经纬、作用机理、药效结果、专利概况与合成方法等。

Synthesis of PPA are intermediate ester methoxy-pyrimidine main raw material; for quinoline acid synthesis; are prepared quinolones (such as: Pipemidic, Ciprofloxacin quinolinic acid, such as containing the quinolone drugs) of raw materials; also are manufacturing and other chemical products dyes intermediates.

是合成PPA的中间体甲氧基嘧啶酯的主要原料；用于喹啉酮酸的合成；是制备喹诺酮类药物(如：吡哌酸、环丙氟哌酸等含喹啉酮酸的喹诺类药物)的原料；亦是制造染料及其他化工产品的中间体。

Synthesis and Thermoelectric Properties of Nano-Skutterudite Compounds by Chemical Methods;2. Thermoelectric Properties and Nanostructuring of Skutterudites;3. The synthesis approaches and its characteristic of skutterudite compounds,such as smelting,solid-state reaction,mechanical alloying and spark plasma sintering etc were reviewed.

回顾了熔融法、固相反应法、机械合金化和放电等离子烧结技术等方钴矿热电材料的制备方法及其特点，重点阐述了在方钴矿化合物中固溶Fe，Ni等元素，以及在方钴矿化合物中填充碱土或稀土元素对热电性能的改进；同时介绍了低维化对方钴矿化合物的热电传输特性的影响。

Through the comparison between methanol synthesis process and ammonia synthesis process, the specific features of chemical production process with different product and their effects on integration of the polygeneration system are discussed.

首先概述了多联产系统集成的原则思路，分析了生产醇醚燃料和合成氨的两类化工系统的流程特点，指出了其对化工和动力系统集成的影响。

With high efficiency, high selectivity, security and environmental friendship, the biocatalysis possesses significant advantages over chemical catalysis in organic synthesis, especially in the asymmetric synthesis of the enantiomerically pure compounds and in the resolution of racemates.

生物催化的高效性、选择性、安全性以及环境友好等优点，使其在一些化学合成领域，特别是在对映体纯的手性化合物的合成和消旋体拆分等方面，具有化学催化不可比拟的优势。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失