In a theoretical study of the reaction between CH 3 C • HNH 2 + O 2 a calculated CBS-QB3 atomisation energy of -6.1 kJ mol -1 is given, in conjunction with ∆ f H -• (0 K) of +37.248 kJ mol -1 from ATcT 36 a formation enthalpy for 2-oxiranamine of -43.4 kJ mol -1 can be derived; this compares not unfavourably with the higher level result of -40.1 kJ mol -1 computed here, Table .