Methods: Simvastatin was synthesized from lovastatin via acetylization, methylation, hydrolytic decomposition and cyclization reactions.

The effect of solvents and steric hindrance on the stereochemistry of cyclization is investigated in details.

并且考察了在环合反应中溶剂和空间位阻对立体选择性的影响.

This paper describes the various cyclization reaction by neighboring group participation.

本文总结了邻基参与的各类环化反应.

Application of samarium diiodide in mediating intramolecular cyclization reactions was reviewed.

综述了二碘化钐在分子内环化反应中的应用.

METHODS Cilnidipine was synthesized from cinnamyl alcohol by esterification, feminization and condensation-cyclization.

方法以肉桂醇为原料,经酯化 、 氨化和缩合 - 环合而得.

Menthol was obtained from lemon eucalyptus oil via cyclization and catalytic hydrogenation.

以柠檬桉叶油为主要原料经环化、催化氢化二步反应得到薄荷醇.

Sulfuric acid and acetic anhydride were used as a cyclizing agent to prepare Ofloxacin intermediate.

用硫酸乙酐混合物作环合剂,制备了氟嗪酸中间体.

According to the control characteristics of cyclo converter, paper proposes a new multi-CPU computer control system.

根据交-交变频器的控制特性, 提出了较为新颖的多CPU计算机控制系统结构.

The feasibility of the new cyclo converter and its performancesteady state are validated by simulation.

通过仿真计算验证了其反送功率至工频系统可行性.

Silazanes were divided into chain-silazane, cyclo-silazane and poly-silazane according to the material variety and synthesis method.

硅氮烷根据原料以及合成方法的不同可分为链 硅氮 烷、环硅氮烷、聚硅氮烷等.

AC excited generator ( ACEG ) and cyclo converter are principal harmonic sources in ACEG systems.

交流励磁 电机和交交变频器是交流励磁电机系统中最主要的两个谐波源.

Finally , cyclo (-Ab 7-Aib-Phe ( 2-Me )-D-Pro-) is successfully prepared by using liquid phase peptide synthesis with Boc protection.

Boc -Ab7-Aib-Phe( 2-Me)-D-Pro-OBzl脱除两端保护得到线性肽链经过环化得到目标产物cyclo ( -Ab7-Aib-Phe ( 2-Me ) -D-Pro- ),收率0.8%.

The synthesis of cyclo (-Ab 7-Aib-Phe-D-Pro-) which uses solid phase peptide synthesis with N-Fmoc protection is faild.

本论文尝试用固相法氨基酸N端Fmoc保护策略合成cyclo ( -Ab7-Aib-Phe-D-Pro- ).但是最终产物经ESI-MS分析不是目标产物,故改用液相法合成目标化合物.

The cycloaddition itself is the slow step.

环化作用本身是慢的一步.

Asymmetric 1, 3-dipolar cycloaddition can be strongly catalyzed by chiral oxazaborolidines.

手性唑硼烷酮能够催化不对称1, 3偶极加成反应并取得很好的效果.

This article details the cyclohexanone production process by liquid cyclohexane oxidation and its improvement.

介绍了环己烷液相氧化法生产环己酮的工艺以及其改进情况.

The dispersion of inorganic agent in polypropylene was simulated by using cyclohexane as a dispersion medium.

采用环己烷作为分散介质来模拟无机抗菌剂在聚丙烯中的分散性.

Research progress on several new processes of cyclohexanone production by cyclohexane catalyzed oxidation is also introduced.

同时,还介绍了几种环己烷催化氧化制环己酮的新工艺研究进展.

A set of coupling reactor and distillation column to synthesize cyclohexane was put forward.

改进了固定床和反应精馏合成环己烷的方法,提出了反应器与精馏塔外耦合的新方法.

A physical and distillation method was applied to the separation of an isopropanol-cyclohexane andisopropanol liquids.

研究了大学物理化学实验中产生的异丙醇 - 环己烷废液的回收利用方法.

Methods : Vitamin A extracted from ChengzhiYuyou by using cyclohexane was determined by using the derivative spectrophotometry.

用环已烷萃取橙汁鱼油中的维生素A后,用一阶导数分光光度法测定其含量.