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    • 1. 发明申请
    • PREPARATION OF CYCLIC OLIGOMERS OF SUBSTITUTED CYCLIC ETHERS
    • 替代循环的循环低聚物的制备
    • WO1997003105A1
    • 1997-01-30
    • PCT/GB1996001599
    • 1996-07-05
    • THE SECRETARY OF STATE FOR DEFENCEDESAI, Hemant, Jashbhai
    • THE SECRETARY OF STATE FOR DEFENCE
    • C08G65/22
    • C07D323/00C07D305/06C08K5/0016C08K5/159
    • A method of producing cyclic oligomers of substituted oxiranes and oxetanes involves the slow addition to a solution of the ether in a relatively polar organic solvent such as dichloromethane or dichloroethane, of a stable protonic acid such as HBF4 or a cationogenic species for example triethyloxonium tetrafluoroborate or an alcohol in conjunction with a stable Lewis acid such as boron trifluoride etherate. The cyclic oligomer product is isolated from other reaction products, in particular the straight chain oligomers, by extraction with a non-polar solvent, hexane being preferred. The cyclic products are effective plasticisers for polyether polymers, particularly where the cyclic ether is related to or even the same as the ether in the polymer since compatability of the materials is then very likely and separation out of plasticiser unlikely to occur.
    • 制备取代的环氧乙烷和氧杂环丁烷的环状低聚物的方法涉及在诸如二氯甲烷或二氯乙烷的相对极性的有机溶剂如二氯乙烷或二氯乙烷中缓慢加入稳定的质子酸例如HBF 4或阳离子性物质,例如三乙氧基四氟硼酸盐或 与稳定的路易斯酸结合的醇,例如三氟化硼醚合物。 通过用非极性溶剂萃取,优选己烷,从其它反应产物,特别是直链低聚物中分离出环状低聚物产物。 环状产物是用于聚醚聚合物的有效的增塑剂,特别是当环醚与聚合物中的醚相关或甚至与聚合物中的醚相同时,因为材料的相容性非常可能,并且不可能从增塑剂中分离出来。