R. Bartnik et al., FLASH VACUUM THERMOLYSIS OF 4 MEMBERED RINGS CONTAINING NITROGEN ATOM.1. THERMAL-DECOMPOSITION OF AZETIDINES, Polish Journal of Chemistry, 68(4), 1994, pp. 719-725
The addition of acetic acid or hydrogen chloride followed by the nitro
sation of azabicyclobutanes produced 1-nitroso-3-acetoxy-(or -chloro)a
zetidines. The thermal decomposition of these compounds under FVT cond
itions was studied. The cycloreversion of azetidine ring, entirely reg
ioselective, was observed.