Different Behavior of the Reaction between 1,2-Diaza-1,3-butadienes and 1,2-Diamines under Solvent or Solvent-Free Conditions - Attanasi, Orazio A; De Crescentini, Lucia; Favi, Gianfranco; Filippone, Paolino; Lillini, Samuele; Mantellini, Fabio; Santeusanio, Stefania (Synlett, 2005)