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- Based on it, the synthesis method has been improved. Several new compounds have been prepared by the Grignard reaction of its hydro-genation product. 在此基础上,改进了它的合成方法,并通过它的氢化产物的格氏反应,制备了一些新的化合物。
- Two different synthetic pathes of DBC (Dimethyl Benzyl Carbinol) were compared. Various factors that effect the Grignard reaction have been discussed. The proper technical condition is determined. 本文通过对二甲基苄基原醇的两条不同的合成路线的比较,研究了影响合成二甲基苄基原醇的几个因素,确定合成的最佳工艺条件。
- the Grignard reaction 格氏反应
- The influence of reaction temperature and time,solvent and the molar ratio of starting materials on alkylation of tin with the Grignard reagent was investigated. 探讨了溶剂种类、时间、温度、原料配比等因素对格氏试剂和锡的烷基化反应的影响。
- Compound 5 is synthesized through Frieldel-Crafts reaction, Grignard reaction and substitution reaction from compound 1 which serves as starting materials. 以化合物1为起始原料通过付克反应、格氏反应和取代反应，得到最终产物化合物5。
- The target compound was synthesized from 1 bromo 3 chloro propane by amination and Grignard reaction with ethyl orthoformate. [方法 ]以 1-溴 - 3-氯丙烷为原料 ,胺化后 ,与原甲酸三乙酯进行格氏加成反应 ,得目标化合物。
- It seems that preparation from hexafluoroacetone through Grignard reaction has superiorities as facile raw materials, simple operation and so on. 认为以六氟丙酮为原料经格氏反应制备六氟-2-甲基异丙醇具有原料易得、操作简便等特点,值得进行深入研究。
- An equatorial methoxy group was completely inert to the Grignard reagent. 位于平伏键的甲氧基，则没有这种可能，因而不发生反应。
- Thiopheneethanol was synthesized from thiophene through bromination, followed by Grignard Reaction, then react with ethylene oxide, and finally hydrolysis. 以噻吩为原料 ,经溴化、格氏反应制得格氏试剂 ,而后与环氧乙烷反应 ,合成了 2噻吩乙醇 ,总分离产率达 80%25。
- AimTo determine the structure of the by-pro du ct produced in Grignard reaction for preparing mifepristone derivatives, and elu cidate the reaction mechanism. 目的 确定米非司酮衍生物制备过程中格氏反应一步的副产物的结构 ,并分析反应机理。
- A high-quality and high-yield tricyclohexyltin chloride product was obtained via alkylation between the Grignard reagent and the complexes formed by the reaction of tin tetrachloride and appropriate ethers. 先将四氯化锡与适量醚类化合物形成配合物,再与格氏试剂发生交换反应,可得到高品质和较高收率的三环己基氯化锡产品。
- Steric effects in 126 may also be responsible for its inertness to the Grignard reagent. （126）的空间效应也是它对格氏试剂反应迟钝的原因
- Menaquinone was prepared by catalytical hydrogenation, methoxy protection, bromization, Grignard reaction, and released protection by the reaction of oxidation. At last, vitamin K_(2(20)) been synthesized. 本文以2-甲基萘醌、香叶醇以及乙酸香叶酯为起始原料,经过催化加氢、甲氧基保护、溴代、格氏反应以及氧化脱保护等反应,最终合成了维生素K_(2(20))。
- The target compound was synthesized from xylene which is subjected to eight steps: nitrofication, reduction, diazotization,decomposition, chlorination, Grignard reaction, esterification, hydro-lysis etc. 以对二甲苯为原料，经过硝化，还原，重氮化，热分解，氯代，格氏反应，酯化，水解共八步反应，得到了一较纯的产物。
- The best yields are obtained if the ether solvent is distilled from the Grignard under vacuum and replaced with hydrocarbon solvent, such as benzene. 如果用碳氢化合物溶剂替代在真空条件下从格林尼亚试剂中提取的空气溶剂，这将获得最大的产出。
- The key step in the synthesis is Wittig coupling of farnesyltriphenylphosphonium bromide (8) with ethyl 2-oxo-3-methyl butyrate (3). (3) was prepared by Grignard reaction of ethyl oxalate with iso-propylmagnesium bromide. 其中关键步骤是溴化法呢基三苯基?(8)和2-氧代-3-甲基丁酸乙酯(3)的Wittig反应。
- The wind whirled the dead leaves about. 风吹得枯叶在四处回旋。
- Six isomers of sodium dodecyl xylenesulfonate were synthesized from chloride and o-xylene via a five-step process involving Friedel-Crafts reaction, Grignard reaction, reduction, sulfonation. 以酰氯、邻二甲苯为原料,经傅-克酰基化反应、格氏反应、还原反应、磺化及中和5步反应,合成了6种结构明确的十二烷基二甲苯基磺酸钠异构体。
- The wind was whispering in the trees. 一阵风穿过树林沙沙作响。
- There are 26 letters in the English alphabet. 英语字母表中有26个字母。
