CO 3 solution occurs in two steps: in the first step, cleavage of the tetrahydrotriazine ring occurs; and in the second step, opening of the perhydrooxazine ring occurs.

Ring opening reactions O 0132Hydrolysis of 7,7-Substituted Derivatives of 3-tert-Butyl-3,4-dihydro-2H-thiazolo[3,2-a][1,3,5]triazin-6(7H)-one. -Base-mediated hydrolysis of the title compounds can occur -depending on the process conditions -with cleavage of the tetrahydrotriazine ring, with cleavage of the thiazolidine ring, and also with opening of both rings. -(RAMSH, S. M.; IVANENKO, A. G.; SHPILEVYI, V. A.; MEDVEDSKIY, N. L.; KUSHAKOVA, P. M.; Chem. Heterocycl. Compd. (N. Y.) 41 (2005) 7, 921-928; St. Petersburg State Tech. Univ., St. Petersburg 195251, Russia; Eng.) -A. Forchert 15-039