Unusual cationic copolymerization behavior of a six‐membered ring spiro‐orthocarbonate bearing adamantane backbones with a monofunctional epoxide

摘要: Copolymerizations of a six-membered ring spiro-orthocarbonate bearing adamantane backbones (AD-SOC, 1) and monofunctional epoxide, PGE, in the presence cationic initiators such as Sc(OTf) 3 were carried out under various reaction conditions. As result, instead anticipated poly(ether-ether-carbonate) 11, two types copolyethers (12 18) consisting or three ether components having different substituent groups unusually formed along with evolution carbon dioxide gas, which AD-SOC efficiently acted corresponding oxetane equivalent monomers 4. Furthermore, copolymerization behavior, including formation 12 18, unexpectedly significantly depended on conditions, concentration initiator. For example, copolymerizations 5 mol % mainly afforded copolyether while those 1 gave 12. In addition, treatments also yielded CH 2 Cl , THF, DMF-insoluble networked products, indicating relatively higher thermal stability compared common polyether.