CCl2FO2 radicals are produced in the stratosphere from the oxidation of CCl2F radicals produced from the photodissociation of CCl3F. The reactions of CCl2FO2 with NO and NO2 have been studied by steady state photolysis at 1 atm and 286--305 ¿K. The reactions are CCl2FO2+NO→CCl2FO+NO2 3 CCl2FO2+NO2(+M) →CCl2FO2NO2(+M) 4,-4 with k3/k4=0.58¿0.10 over this temperature range. The thermal decomposition of CCl2FO2NO2 via the back reaction -4 was studied at 274--305 ¿K and 1 atm total pressure (mainly N2). The Arrhenius expression obtained for the thermal decay is k-4=1016.6¿1.0 exp{12300¿600)/T} s-1 In the stratosphere CCl2FO2NO2 will be produced from reaction 4 and since its thermal lifetime at 220 ¿K exceeds 1 year it could play a role in the stratospheric chlorine budget if it is sufficiently stable to photodissociation.