Tethering strategies in alkynylamino carbene complexes

During the synthesis of complex cyclic macromolecular structures, the reaction of different mono- di- and triamino alkynyl metal carbene systems with primary and secondary amines was studied. The results showed the low stability of the metal carbene complexes obtained from the conjugate addition of primary amines in contrast to the fairly good stability of the corresponding complexes obtained from the addition of secondary amines.