查询词典 first-order reaction

In the first chapter, Barton reaction of C〓-hydroxy was studied.

论文第二部分分两章，第一章主要考察了甾体C〓-羟基的Barton反应，期望通过C〓-羟基的Barton反应进行18-甲基的官能团化。

Results: 36 patients with ami who were misdiagnosed and missed diagnosed had no typical angina pectoris at the onset of disease, and the first manifestations were dyspnea, chest distress, pallor, perspiration, hypodynamia, gastrointestinal reaction, disturbance of consciousness etc, and the electrocardiograms of most patients were untypical.

结果：36例被漏误诊的ami患者起病时多无典型心绞痛，首发表现为呼吸困难、胸闷、面色苍白、出汗、乏力、胃肠道反应、意识障碍等症状，多数患者心电图不典型。

The novel catalysts of Cu supported on ZnO, MgO modified with KF were prepared by the conventional impregnation method, and applied for the first time to the Heck reactions of iodobenzene with n-butyl acrylate as a model reaction.

KF水溶液浸渍MgO或ZnO载体为改性载体制备了负载铜催化剂，以卤苯与丙烯酸正丁酯的反应为模型，考察了对Heck反应的催化性能。

The first synthetic route uses 1,2,4-trimethoxybenzene and chloroacetonitrile in forming 2,4,5-trimethoxy-a-chlor-acetophenone under the anhydrous condition, then the intermediate condensates with papaverine forming the core pyrro[2,l-a]isoquinoline, followed by formation and lactonization to form the lactone ring. The second synthetic route uses prepared aldehyde with prepared ethyl nitroacetate by Knoevenagel condensation to obtain 2-Nitro-3-(2,4,5-tris-methoxy-phenyl)-acrylic acid ethyl ester and 2-Nitro-3-(2,4,5-tris-benzyloxy -phenyl)-acrylic acid ethyl ester etal intermediates. The lamellarin skeleton could arise from condensation of the papaverine and these intermediates by Michael reaction, the ester group is provided for subsequent lactonization. The third synthetic route uses coumarin or indan-l,3-dione derivatives and papaverine to form lamellarin under basic conditions.

第一条路线首先从1，2，4-三甲氧基苯出发与卤乙腈作用合成卤代芳酮中间体，然后与罂粟碱反应合成开链片螺素，最后经乙酰化、去保护、成内酯环得到片螺素；第二条路线由制备的芳醛和制备的硝基乙酸乙酯经缩合得到2-硝基-3-芳基丙烯酸乙酯，然后由该中间体与罂粟碱反应，在完成关环的同时也引入酯基，最后去保护、成内酯环得到片螺素；第三条路线是由香豆素或茚二酮出发，经溴代后的中间体与罂粟碱反应，得到片螺素的基本框架。

Furthermore,H-T is the first soluble,reactive and purely inorganic ladderlike macromolecule,which can be grafted through hydrosilylation reaction and others to generate functional LPSs with different side groups.

而且，该聚合物又是第一个可溶性、反应性、纯梯形主链无机高分子，它可以进一步通过硅氢侧基接枝反应制备不同类型的梯形无机主链功能高分子。

The major direction of the research within the first year will be outlined as following:( 1 )The background study, collection, analysis, and identification of the possible metabolites such as protease, hemolysin, hemagglutinin, cytotoxin, leukocidin, and lipopolysaccharide;( 2 )The collection of the pathogenic factor such as outer membrane protein of vibrio spp.;( 3 )The analysis of pathogenic factor through the application of SDS-PAGE technique; and ( 4 )The activity assay of outer membrane protein on substrate to characterize the possible function or study the reaction mechanism.

致病因子之收集：将利用生物化学之方法，以弧菌属细菌外膜蛋白质为目标，收集与溶血素相关之致病因子。3。致病因子之分析：将利用SDS-PAGE电泳，对所收集得到之致病因子进行分析，并估算其可能之分子量。4。致病因子之活性测试：将利用所纯化之外膜蛋白质进行对受质活性之测试，以确定其功能或可能之作用机制。

For the first time, enantiomers of C2-symmetric 1,1 -spirobiindane-7,7'-diol were resolved with crude menthyl chloroformate by phase-transfer catalysis in the presence of tetrabutylammonium bromide. The reaction was carried out at 0℃-rt. The diastereomers of SPINOL bis-menthyl carbonate can be separated by simple crystallization using alcohol. The hydrolysis of the diastereomers was carried out via aqueous NaOH/EtOH solution.

首次通过相转移催化的方法对螺双二氢茚二酚进行了有效的拆分，用L--氯甲酸薄荷醇酯做拆分剂，以四丁基溴化铵为催化剂在0℃-室温下进行酯化反应生成非对映体衍生物，以乙醇作溶剂，通过重结晶的方法分离衍生物，在水-乙醇混合溶剂条件下，用强碱NaOH或KOH分别水解，制得相应的光学纯度大于99%ee的两个异构体SPINOL，其中总收率：--SPINOL，78.2%；--SPINOL，80.6%。

This invention relates to method of using boron magnesium fertilizer to produce fiber shape magnesium hydroxide fire retardant. First dissolve boron magnesium fertilizer, then add magnesia and oxydol to solution to carry out sulfuric acid neutralization and ferrous ion oxidation, remove iron ion, then add ammonium bicarbonate to carry out metathetical reaction.

利用硼镁肥生产纤维状氢氧化镁阻燃剂的方法，涉及一种制取纤维状氢氧化镁的方法，首先将硼镁肥溶解，然后向溶液中加入氧化镁和双氧水进行硫酸中和与亚铁离子氧化并除去铁离子，然后对余液加入碳酸氢铵进行复分解反应。

The results show that by providing wastewaters pH of about 3 and reaction time of 2 hours, the quantity of H2O2 of 40 mL/L, the concentration of ferrous iron is 0.4 g/L, the effluent of microelectrolysis goes into Biological contact oxidation process, in which DO, HRT and volume load are 4.5 mg/L, 10 hours and 1.0 kg CODCr/(m3·d) respectively, satisfying the first grade of the national standard.

结果表明，在废水pH值为3左右、反应时间2 h的前提下，双氧水投加量40 mL/L，二价铁离子质量浓度为0.4 g/L，再经过微电解处理后的出水进入接触氧化阶段。在溶解氧为4.5 mg/L左右，水力停留时间为10 h、容积负荷1.0 kg CODCr/（m3·d）左右的条件下，出水CODCr小于100 mg/L，可达到国家对丙烯腈废水处理要求的一级标准。

The Monophysitic reaction against the Council of Chalcedon in the sixth century first succeeded in bringing Theodore's person and writings under the ban of the ecclesiastical anathema through the ill-famed dispute of the Three Chapters.

该monophysitic反应，对安理会的chalcedon在第六世纪的第一次成功地使西奥多的人，著作下禁止杀伤人员地雷的教会诅咒透过虐待著名争端的三个章节。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。