(H2C-O-CH2) were studied previously by Bartels et al., using the discharge flow-mass spectrometric method at 298 K in 1 Torr of diluent He.'Interestingly, they reported evidence for the occurrence of both the abstraction and addition channels for the C1+ H2C-O-CH2 reaction with an overall rate constant of 2.8 x lo-" cm3 molecule-'s-'and also for the formation of three isomeric C2H30 radicals (Le., cyclic oxiranyl