Cheletropic decomposition of cyclic nitrosoamines revisited: the nature of the transition states and a critical role of the ring strain.

The cheletropic decompositions of 1-nitrosoaziridine (1), 1-nitroso-Δ3-pyrroline (2), 7-nitroso-7-azabicyclo[2.2.1]hepta-2,5-diene (3), and 6-nitroso-6-azabicyclo[2.1.1]hexa-4-ene (4) have been stu...