十多年来,对季铵盐、冠醚等化合物作为相转移催化剂已有很多报导。然而由于季铵盐的化学稳定性较差,冠醚的价格昂贵且又有毒性,因而其应用受到了一定的限制。最近发现聚乙二醇及其开链醚具有类似于冠醚的性质,是一类新型的相转移催化剂。由于聚乙二醇及其开链醚是一类生产量大、来源丰富、价格低廉的工业产品,如果能把它广泛用于相转移催化反应,这对相转移催化技术在工业生产 More than a decade, the quaternary ammonium salt, crown ether and other compounds as phase transfer catalyst has been reported. However, due to the poor chemical stability of quaternary ammonium salts, crown ethers are expensive and toxic, and thus their applications are subject to certain restrictions. Recently, it has been found that polyethylene glycol and its open-chain ether have crown ether-like properties and are a new class of phase transfer catalysts. Since polyethylene glycol and its open-chain ethers are a kind of large-volume, abundant-sourced and low-cost industrial products, if they can be widely used in phase-transfer catalysis, the application of phase-transfer catalysis in industrial production