Poly(Ether-Carbonate)S from Five-Membered Cyclic Carbonates and Oxiranes

Studies on the reactions of oxiranes with various carbonates (cyclic and linear, aliphatic and aromatic) in the presence of BF3·Et2O are presented. The reaction mechanism is proposed. It was found that poly(ether-carbonate) is formed not only as the product of polymerization of spiroorthocarbonate b...
Ausführliche Beschreibung

Studies on the reactions of oxiranes with various carbonates (cyclic and linear, aliphatic and aromatic) in the presence of BF3·Et2O are presented. The reaction mechanism is proposed. It was found that poly(ether-carbonate) is formed not only as the product of polymerization of spiroorthocarbonate but mainly directly from oxirane and cyclic carbonate. Spiroorthocarbonate is one of the possible reaction products of trioxocarbenium ion - the product of its cyclization. It was shown that as a result of the copolymerization of epichlorohydrin with ethylene carbonate initiated by BF3·Et20 poly(ether-carbonate) containing of about 10% of units originated from ethylene carbonate and 4-chloromethyl-1,3-dioxolan-2-one was obtained. Ausführliche Beschreibung