... Heterocyclic Chem., 21, 1807 (1984). ... 1810 NP Peet and S. Sunder Vol.21 The structures of benzotriazepinones 3a and b were ve- rified by their non-identity ... b, respectively) af- forded only the respective imino ethers 19a and b on treatment with TEOA and p-toluenesulfonic acid ...