“…New breakthroughs may come from some of these new diamines or improvements of some of the already existing and studied structures. Indeed, diamines having a bridgehead structure, − based on aziridine, azetidine, pyrrolidine, − or piperidine core, , derived from cyclobutane, cyclopentane, , or cyclohexane diamines, − derived from metallocene − or other structures, − have already been reported in the literature, but they have not yet been used as tertiary diamines. Considering the restriction we made describing only those having tertiary nitrogen atoms, one can easily obtain a glimpse of the huge potential of diamines in the broad sense of the term when added to all other substitution possibilities.…”