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- Doxifluridine was facilely synthesized from 5-fluorouracil in overall yield of 54.6% via trimethyl silylation, condensation, saponification, ketal formation, iodation, hydrogenolysis and hydrolysis. 以5-氟尿嘧啶为原料经硅醚化、和四乙酰核糖缩合、皂化、酮缩醇形成、碘化、氢解及水解等反应合成了去氧氟尿苷。本法工艺简便、条件缓和、原料易得、成本低;总收率达54.;6
- Estrone was synthesized from andro 1,4 dien 3,17 dione by three steps including ketal formation, aromatization and hydrolysis. The new synthetic method of estrone was verified by amplifying and the overall yield of its amplification was 53.3%( w/w). 以雄甾 - 1;4-二烯 - 3;17-二酮为原料 ;经缩酮化、芳构化和水解三步反应合成雌酮 ;并对此工艺进行中试放大 ;总收率可达 5 3.;3%25。
- The book has been styled in a modern format. 该书已按照现代版式制作。
- ketal formation 酮缩醇的形成
- Her front teeth were irregular in formation. 她的门牙排列不整齐。
- They marched in parade formation. 他们以列队的阵式行进。
- The book is written in an episodic format. 这本书是以一种松散的形式写成的。
- It's the same book, but a new format. 还是那本书，但这是新的版式。
- The formation of two ordered files from one regular file. 把一个正规文件分成两个有序文件的过程。
- The natural process of bone formation. 成骨骨头形成的自然过程
- The formation and development of bodily tissues. 组织发生身体组织的形式的发育
- Formation of a placenta in the uterus. 胎盘形成胎盘在子宫中的形成过程
- The forcing of molten rock into an earlier formation. 侵入熔岩对早先形成岩石的直接进入
- A signal by bugle or drum for troops to come together in formation. 集合号，集合鼓部队集结时以吹号或击鼓发出的信号
- The attack is to wipe out data, to delete flies, or to format the hard disk. 常见的攻击方式是消除数据、删除文件或者格式化硬盘。
- School life has a great influence on the formation of a child's character. 学校生活对小孩个性的形成有很大影响。
- The troops broke formation and ran. 士兵们溃逃。
- A similar formation of groups, units, or individuals. 梯形排列群体、单位或个人的类似排列
- The formation of nitroform is presented as follows. 生成硝仿的过程如下。
- Format this letter so it can be printed out. 编排这封信的格式它就能被打印出来了。
