synthesis yield

Under the conditions , the single synthesis yield of calcium acetylacetonate was 93.41 % .

在该工艺条件下，乙酰丙酮钙的单次合成得率为93.41%。

Through the recovery of calcium acetylacetonate which lost in washing step , the cyclic synthesis yield increased to 99 % .

通过回收损失的乙酰丙酮钙，循环得率提高至99%。

Results The radiochemistry purity of the synthesized 11 C-choline was more than 99 % , the synthesis yield was 95 % .

结果11C胆碱放化纯>99%，合成效率为95%，合成时间5min。

Conclusions The automated on-line preparation method was verified in producing 11C - β - CFT of high radiochemical purity and synthesis yield for a short period of time .

结论在线自动化制备11C-β-CFT效率高，速度快，放化纯高。

Compared with classic liquid-phase synthesis , product yield increased greatly , so PEG also played the role of phase transfer catalyst , improving the reaction rate .

相对于经典液相合成，产物产率得到大幅度提高，因此PEG在反应中还起到相转移催化剂的作用，提高了反应的转化率。

This method of synthesis thioacetal with high yield , short reaction time , high selective .

这种合成硫缩醛的方法，反应速度快，产率高，具有高选择性，所用的催化剂价廉易得。

Using lysine , laminine was prepared by bio-mimetic synthesis method , with yield rate 37.6 % and purity 97.2 % .

本文中采用L-赖氨酸为原料，仿生合成了具有降压活性的昆布氨酸，产率可达37.6%，纯度可达97.2%。

First , effects of synthesis parameters on the yield were investigated by orthogonal experiments , such as catalyst types and dosage , dewater temperature and decomposition temperature .

首先通过正交实验较系统的研究了合成工艺，包括三种不同催化剂（锌粉、乙酸铜及辛酸亚锡）用量、脱水温度及裂解温度对产物收率的影响；

Results and conclusion This improved synthesis with an overall yield of 55.3 % shows the advantages of lower cost of starting materials and reagents , mild reaction condition and simple operation , it is suitable for industrial manufacture .

结果与结论该方法以55.3%的收率简单方便地制备了1H-吲唑-3-羧酸，所用起始原料及试剂的成本低、反应条件温和、易于操作，适合工业化生产。

The synthesis method of quinalphos by the process of compound phase transfer catalyst ( PTC ) and the factors affecting synthesis yield were studied in this paper .

报导了采用复合相转移催化剂合成喹硫磷，并研究了各种因素对合成收率的影响。

A microwave-irradiation technique was applied to the solid phase synthesis of thymopentin , and also the influences of coupling reagents , solvents , reactant concentration , reaction time and temperature on the solid phase synthesis yield of thymopentin with microwave irradiation were investigated .

在胸腺五肽的固相合成中，引入微波辅助技术，深入研究了微波作用下缩合试剂、溶剂、反应物浓度、反应时间和温度对产率的影响。