In this communication we present the main results obtained in the study of AGNs showing extreme IR continuum and Fe II emission lines. Furthermore, we discuss that these objects can be young QSOs at the end phase of a strong starburst with superwind and superbubbles (suggested by Lipari, Terlevich &: Machetto 1993). Also, we discuss the origin of broad absorption lines (BAL) systems, associated to the phase of young QSO.