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相转移催化反应是近年来兴起的一种新合成技术.它具有反应快、条件温和、操作简便和产率高等优点.冠醚是当前引人注目的一类相转移催化剂,它不但能进行液-液相转移反应,而且还能进行液-固相转移反应;又因它可直接使固体晶格打开,因此在反应过程中不引入水等杂质;又因它是中性配体,所以也不会因它而带入另一阴离子.故它具有鎓盐类无法比拟的优点.小分子冠醚制备难、毒性高、价格贵、难回收,使其在工业上
Phase transfer catalysis is a new synthetic technology that has emerged in recent years.It has the advantages of fast reaction, mild conditions, simple operation and high yield.The crown ether is currently a kind of phase transfer catalyst attracting attention, it can not only liquid - liquid phase transfer reaction, but also for liquid - solid phase transfer reaction; because it can open the lattice of solids directly, so in the reaction does not introduce impurities such as water; because it is a neutral ligand, so It will not bring another anion because of it, so it has the advantages of onium salts.Preparation of small molecule crown ether difficult, high toxicity, expensive, difficult to recover, make it in the industry