Copolymerization (Scheme 1) of ST the ring-substituted ICPA resulted in formation of copolymers (Table ) with weight-average molecular masses 13.5 -69.5kD. Since ICPA monomers do not homopolymerize, the most likely structure of the copolymers would be isolated ICPA monomer units (n = 1) alternating with short ST (m = 1 -4) sequences (Scheme 2). The copolymers prepared in the present work are all soluble in ethyl acetate, THF, DMF and CHCl3 and insoluble in methanol, ethyl ether, and petroleum ether. According to the nitrogen elemental analysis, between 13.5 and 31.2 mol% of ICPA monomer is present in the copolymers, which is indicative of relatively high reactivity of the monomers towards ST. a Conditions: ST/ICAA: 3 (mol) / Toluene / 70ºC / 5 hrs.