Alongside, the chemical reactions for the key steps in this synthesize process i. e, the condensation, decomposition, ring-closing, separation, etc. are given.
给出了合成过程中缩合，分解、闭环，离析等关键步骤的化学反应；
The five quinazoline compounds were prepared by using 2 amino 4,5 dimethoxy benzoic acid as original material, which underwent ring closing, halogenation and substitution.
方法：以2氨基4 ，5二甲氧基苯甲酸为原料，分别经过环化、氯代、取代等反应，合成了五种目标化合物。
Then coupling with A ring synthon, closing, deprotection, the aim product was synthesized finally.
然后再与A环合成子偶联、关环、脱保护完成目标产物的全合成。
The closing bell rings at 4 p. m. Many famous people at different times have obtained the honour to ring it.
收盘的钟声在下午四点响起，许多不同时期的名人都得到过敲钟的荣誉。
The forming technology and the forming die of each working process for the closing ring were analyzed.
分析了卡圈成形工艺及各单工序成形模具特点。
And whatever you do, do not ring the bell hanging behind the counter---this is used by the landlord to signal closing time.
在不该干的事当中还绝对不要摇晃挂在吧台后面的铃，那是酒吧老板用的，表示关门门时间到了。
An elastomer or adhesive ring filling the recess is arranged between the closing element and the recess for the positioning of the cap.
当装上帽盖时，一个弹性体环或粘合剂环设置在封闭元件与凹陷之间，该弹性体环或粘合剂环填满所述凹陷。
Ring closing metathesis (RCM) of dienes to cycloalkene provides an important tool for C-C double bond formation catalyzed by metal carbene.
关环转换反应是形成碳碳双键的重要反应之一，即双烯化合物在金属碳烯催化下关环得到环烯类化合物。
Time for the third kind of closing well is so long that flange steel ring groove on the top of casing-head is heavily corroded in M4 well being situated in Tarim basin.
位于塔里木盆地的M4井，由于三类封井时间较长，造成套管头上部法兰钢圈槽严重腐蚀。
Based on the summery of research findings by the predecessors, the invention is novel in direct synthesis of amide surfactants by vacuum-amphoteric method without ring closing reactions.
本发明在总结前人研究成果的基础上，不经过关环过程，创新性地采用真空—两性化法直接合成酰胺型表面活性剂。
And whatever you do, do not ring the bell hanging behind the counter---this is used by the landlord to signal closing time.
该干事当中绝对要摇晃挂台后面铃，酒老板用，表示关门时间到。
The synthetic method is novel in the direct synthesis of amide surfactants by vacuum-amphoteric method without ring closing reactions.
本发明方法不经过关环过程，创新性地采用真空―两性化法直接合成酰胺型表面活 性剂。
The pull head and the pull ring on the zipper move to the closing end of the zipper; the iron sounder can separate from the magnetic body, and makes the sound to remind people to close the zipper;
拉链上的拉头及拉环一向其闭合端移动，铁质发声器就会脱离磁性体而发出 响声，提醒人们关闭好拉链；
The pull head and the pull ring on the zipper move to the closing end of the zipper; the iron sounder can separate from the magnetic body, and makes the sound to remind people to close the zipper;
拉链上的拉头及拉环一向其闭合端移动，铁质发声器就会脱离磁性体而发出 响声，提醒人们关闭好拉链；
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