Abstract
2 ,6 ,7-Trioxabicyclo[2.2.1] heptane (I) polymerizes to poly ortho ester (Poly-I) at −78°C with opening of one ring and volume shrinkage. Heating Poly-I with acid isomerized it to an open chain poly-ether formate (Poly-II); this occurred with a large volume expansion. Direct conversion of I to Poly-II by heating with acid occurred with net moderate increase. Monomer I is the first reported monomer which can be polymerized with either shrinkage or expansion as desired. Saponification of Poly-II gave Poly-III, a new water-soluble copolymer.
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