Mass limits at Z = 10^-5 for the formation of carbon-oxygen and oxygen-neon white dwarfs, supernovae type I1/2 (for stars whose CO core reach m_Ch), electron-capture supernovae (for stars whose ONe cores reach m_Ch) and supernovae type II. These mass limits are represented for the cases in which Vassiliadis & Wood (1993) are used (full calculations), and for the cases in which this rates are decreased one order of magnitude.