Synthesis and polymerization of 7-alkoxycarbonyl-7,8,8- tricyanoquinodimethanes and 7,7-bis(alkoxycarbonyl)-8,8- dicyanoquinodimethanes

Article abstract of DOI:10.1016/S0040-4020(97)00961-7

Attempts were made to prepare hover 7-alkoxycarbonyl-7,8,8- tricyanoquinodimethanes (ethoxy(5a), isopropoxy(5b), and tert-butoxy(5c)), 7,7-bis(alkoxycarbonyl)-8,8-dicyanoquinodimethanes (ethoxy(6a), isopropoxy(6b), and tert-butoxy(6c)), and 1-(2,2-dimethyl-1,3-dioxane-4,6- dione-5-ylidene)-4-(dicyanomethylene)-2,5-cyclohexadiene(6d). 5c and 6d were obtained as yellow and orange needles, respectively, but 5a, 5b and 6a-c could not be isolated as crystals. Homopolymerizations of 5c and 6d and their copolymerizations with styrene were studied.