Preparation of Novel Thermally Stable Polyurea by the Cationic Ring-Opening Isomerization Polymerization of Polycyclic Pseudourea

Isolation and cationic ring-opening poly

Isolation and cationic ring-opening polymerization of 2,3,5,6-tetrahydroimidazo[2,1-b][1,3]oxazole to produce a thermally stable polyurea

✍ Masatoshi Miyamoto; Toshio Watanabe; Yoshiharu Kimura 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 253 KB

## Abstract A bicyclic pseudourea, 2,3,5,6‐tetrahydroimidazo[2,1‐__b__][1,3]oxazole (1), was isolated for the first time, and its cationic and spontaneous polymerizations were examined. Both polymerizations gave poly(1,3‐imidazolidin‐2‐one‐1,3‐diylethylene) (2) in high yields. The polymer is a crys