十多年来,季铵盐、冠醚等化合物作为相转移催化剂已有很多报导。近年来发现聚乙二醇及其开链醚具有类似冠醚的性质,可作为一类新型的相转移催化剂。由于聚乙二醇及其开链醚是价廉的工业产品,毒性较小,使用简便,受到人们普遍的重视。为了对这类新型相转移催化剂的本质有进一步的了解,本文根据我们近期的研究工作和国内外有关报 For more than a decade, many compounds such as quaternary ammonium salts and crown ethers have been reported as phase transfer catalysts. In recent years, it has been found that polyethylene glycol and its open-chain ether have crown ether-like properties and can be used as a new type of phase transfer catalyst. As polyethylene glycol and its open-chain ether are inexpensive industrial products, less toxic and easy to use, people are generally valued. In order to further understand the nature of this new type of phase transfer catalyst, according to our recent research and relevant reports at home and abroad