ABSTRACT:The maximum conversion of an intramolecular reaction between neighboring substituents on specially-designed alternating copolymers was calculated theoretically. The terpolymer of monomers A, D1, and D2 , were supposed to consist of two alternating units, A-D1 and A-D2, distributed in a certain statistical state. In such a modified alternating copolymer, substituent X on unit A was permitted to perform the intramolecular reaction only with substituent Y1 on unit D1, not with Y2 on D2 . As a result, the theoretical maximum conversion could be expressed as a function of a mole fraction of A-D1 . If these alternating units were arranged as alternatively as possible, the best conversion near to 100% could be achieved over a wide range of the A-D1 fraction. Even if the arrangement was random, a considerably good conversion beyond 86.5% could still be expected. However, the blocky arrangement resulted in limiting the yield to 86.5% (Flory's limit) which was equal to the statistically possible level in the simple alternating copolymer of A and D1.