2-, 3- or 4-arylpyridines are prepared by reacting a halopyridine with an aryl Grignard compound, where the halogen is chlorine or bromine, in the presence of a palladium catalyst of the formula (IV)Antje NoerenbergSteffen HaberAndreas Meudt...
百度试题 结果1 题目Salt is a compound of sodium and chlorine.. 相关知识点: 试题来源: 解析 复合物,化合物. none. 反馈 收藏
29. Chlorine is passed into a colourless aqueous solution of a compound Z. At first, brown colour is seen and then a black precipitate appears. What could Z be?C A. ammonia B. iron(lll) sulphate C. potassium jodide D. sodium hydroxide 相关知识点: 试题来源: 解析 C 反馈 收藏 ...
A compound is a substance made up of two or more different chemicals held together by chemical bonds, while an element is a pure substance that cannot be broken down into simpler substances by chemical reactions.Answer and Explanation:
A compound is another term for a molecule. A molecule consists of two or more atoms (elements) that are bound together by either a covalent or an ionic bond. PurityThe purity of a compound can be examined using different chemical techniques. Examples may include thin layer chromatography or ...
as magnesium halide source, a magnesium compound represented by a formula (RMgX)p(MgX2)q, in which R is an alkyl group having from 3 to 12 carbon atoms, X is halogen, preferably chlorine, and molar ratio of q to p is in the range from larger than 0 to 1, preferably from 9.05 to...
4 The electronic structure of a compound formed between an element Y and chlorine is shown below (only valence electrons are shown).CI What is the chemical formul a when sodium combines with element Y? C A Na2Y B NaY2 C Na_3Y D Na_5Y 相关知识点: 试题来源: 解析 C 反馈 收藏...
compound / 5kCmpaUnd; `kBmpaJnd/ n 1 (a) thing made up of two or more separate things combined together 复合物. (b) substance consisting of two or more elements chemically combined 化合物: Common salt is a compound of sodium and chlorine. 食盐是钠和氯的化合物. Cf 参看element 3, mix...
However, the detection of DMPOOH could have had two different origins, which may have resulted from the reaction (Eq. 3) or more likely due to the gradual decomposition of DMPO-SO4 in water. Further confirmation of the oxidation of Tyr-was obtained from UPLC-MS analysis of their mixture, ...
Many drugs bind to and activate human pregnane X receptor (hPXR) to upregulate drug-metabolizing enzymes, resulting in decreased drug efficacy and increased resistance. This suggests that hPXR antagonists have therapeutic value. Here we report that SPA70