冠醚合成的模板效应──3个小环冠醚合成方法的改进

TEMPLATE EFFECT IN THE SYNTHESIS OF CROWN ETHER──Improvement in the synthesis of three smallcycle crown ethers

根据冠醚合成模板效应和反应机理的特点，选用合适的模板离子和反应条件，合成了３个小环冠醚，取得了满意的实验结果，为其它小环冠醚的合成提供了一种很好的新方法．

The synthesis of three smallcycle crown ethers-B-12-C-4, 3'-n-pentadecylbenzo-12-C-4 and 6-hydroxyl dibenzo 14-C-4 have been studied in this paper. By analysisingthe mechanism of these reactions such as the template effect,the fittable templateion,reaction conditions and the orders of adding reaction substances have been changed. All that haveimproved the yields of these crown ethers effectly. Also,the opration of separation and purifying have been simplized successfully.