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- The calculated results show that the aza Wittig reaction is a two step reaction, having one four membered ring intermediate on its reaction surface. 计算结果表明该反应是一个二步反应，在反应途径上存在一个四元环中间体。
- Then the protected D-mannitol, mixed with lead tetraacetate, hippuric and acetic anhydride, were refluxed in THF for 18 h in a one-pot two step reaction to afford a chiral precursor (Z)-2-phenyl-4-[(S)-2,3-O-(isopropylidene)]-propylidene-5(4H)-oxazolones. 产物与四乙酸铅、马尿酸、乙酐于THF中回流18 h完成一釜二步反应，纯化后得到含有手性碳原子的环丙烷氨基酸前体(Z)-2 苯基-4-[(S)-2，3-O-(异丙叉)]丙叉?f唑-5-酮，前体中的手性碳原子可作为环丙烷氨基酸衍生物不对称合成的手性源；
- Glyceryl dilaurate was synthesized through two steps reaction by sodium Laurate and epichlorohydrin with the help of phase translational catalyst cetyl trimethyl ammonium bromide. 以月桂酸钠和环氧氯丙烷为起始原料,在相转移催化剂十六烷基三甲基溴化氨作用下,经过两步反应,合成了二月桂酸甘油酯。
- With synthesis of a quaternary ammonium gemini surfactant as an example.The process involves two steps reaction: quaternization reaction and urethane reaction. 摘要以合成一种季铵盐双子表面活性剂为例，过程包括季铵化和胺酯化两步反应。
- The modified petroleum resin (MPR) were prepared by two step reactions firstly reacting petroleum resins with maleic anhydride, and then esterificating of the addition, products with isooctyl alcohol. 通过对石油树脂与顺丁烯二酸酐反应条件的考察,确定了其最佳反应条件。
- Study on the phase diagram of the second step reaction system of synthesis potassium sulfate by gypsum two step method 石膏两步法制取硫酸钾第二阶段反应体系相图研究
- Ay, get it right, two step and let your shou[...... 您浏览了太多的页面，所以您无法看到该页的内容...
- Probenazole, control of rice blast, was synthesized via a two - step reaction: chlorination and condensation , starting from saccharin. 烯丙异噻唑是用于防治水稻稻瘟病的杀菌剂,以糖精为原料,经氯化,缩合两步反应合成。
- One step, two steps, tickled under there! 然后一步步走上手臂，再到腋下搔痒!
- Polymers are most commonly formed by two main types of growth reaction traditionally referred to us condensation (step reaction) and addition (chain reaction) processes. 形成聚合物的最普通方式是靠两种主要的增长反应，习惯上分别称做缩合（逐步反应）过程和加成（链式反应）过程。
- In fact the clean and jerk consist of two steps. 挺举实际上包括两个步骤。
- The two steps cannot be confused. 这两个步骤不能搞混了。
- He tore up the stairs two steps at a time. 他一步两个台阶地飞奔跑上楼。
- Signing code happens in two steps. 对代码进行签名的过程包含两个步骤。
- Why are there two steps to signing? 为什么需要用两步来进行签名呢?
- To turn around and I'll be two steps behind. 你会惊喜的发现我就在你身后两步默默注视着你。
- Cationic mono-ester surfactants(CMESA)was prepared using glycidyl trimethyl ammonium chloride(GTMAC)and stearic acid as starting materials with a single step reaction. 以自制的失水甘油基三甲基氯化铵(GTMAC)和硬脂酸为原料,经一步反应合成阳离子单酯表面活性剂(CMESA)。
- The design procedure is divided in to two steps. 设计过程分为两步。
- He took two steps and then he turned around. 其实意思很简单,就是他走两步然后转过身。
- Homopiperazine was synthesized by using diethylamine as starting material via three step reaction of tosylation,cyclized and detosylation. 以乙二胺为初始原料,经磺酰化、环化、脱磺酰化3步反应合成高哌嗪,总收率可达78%25。
