We have examined CF3OCF=CF2 regarding its reactivity toward OH radical, its infrared spectroscopic properties, its atmospheric lifetime, and its radiative forcing. From these we then determined the Global Warming Potentials (GWPs) for CF3OCF=CF2. The examination is completed using a combination of discharge flow coupled with mass spectrometer and resonance fluorescence (DF/MS/RF), Fourier transform infrared (FTIR) spectroscopy, ab initio molecular orbital calculation, and atmospheric and radiative transfer modeling. Mass spectral evidence suggests that both HF and CF3OCFC(O)F are products from the reaction of CF3OCF=CF2 with OH. The Arrhenius expression for CF3OCF=CF2+OH is determined to be k1=(6.41¿0.82)¿10-11 exp<(-868¿40)/T> cm3 molecule-1 s-1 in the temperature range of 253--348 K. The atmospheric lifetime of CF3OCF=CF2 is estimated to be less than 5 days due to the OH attack. The calculated vibrational frequencies using ab initio molecular orbital calculations are in good agreement with FTIR experimental observation for the CF3OCF=CF2 molecule. Both C-O and C-F stretching modes in the CF3OCF=CF2 contribute to prominent absorption in the atmospheric window region. The absolute adjusted radiative forcing at the tropopause due to an increase in the concentration of CF3OCF=CF2 by one part per billion by volume (ppbv) is calculated to be 0.041 W m-2 ppbv-1. The Global Warming Potential for CF3OCF=CF2 is evaluated to be 0.004 for 100-year time horizon. ¿ 2000 American Geophysical Union