Abstract
The ring-opening-closing alternative copolymerization (ROCAC) of four cyclic phosphonites (1) with four dialdehydes (2) including aliphatic and aromatic dialdehydes is described. The reaction of a 1:1 monomer feed ratio proceeded without any added catalyst to give an alternating copolymer 3 involving ring opening of 1 and ring closing of 2. The structure of copolymer 3 was determined. The copolymerization is reasonably explained by a mechanism of propagation via zwitterion intremediatesal analysis. The electrophilic reactivity of a carbonyl carbon in 2 toward a monomer 1 was quantitatively examined
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