cyclobutane adducts of strong donor olefins and strong acceptor olefins, 1,1,2,2-tetracyano-3-ethoxycyclobutane (1a) and dimethyl 2,2-dicyano-3-ethoxycyclobutane-1,1-dicarboxylate (1b), with 2-oxazolines (2) are described. In the reaction of 1b with 2-methyloxazoline (2b), the alternating copolymer of 1b and 2b, the 1:1:1 periodic terpolymer of dimethyl 1,1-dicyanoethylene-2,2-dicarboxylate, vinylether, and