Intermolecular C-C Coupling between 1-Methyl-1,2,3-Triazole and 2,2'-Bipyridine or 1,10-Phenanthroline in MoII Complexes.

Unsupported 1-methyl-1,2,3-triazole has been coordinated to {Mo(η3 -methallyl)(CO)2 (N-N)} (N-N=2,2'-bipyridine, bipy; or 1,10-phenanthroline, phen) fragments, yielding cationic complexes that can be regarded as metalated triazolium salts. Their reactivity towards a strong base led to the deprotonation of the C5-H group of the triazole moiety, followed by an intermolecular nucleophilic attack to the ortho CH group of a bipy or phen ligand affording cyclic, bimetallic dearomatized C-C coupling products. The reaction of the neutral bipy derivative with an acid led to the formation of dihydropyridyl units by protonation of a CH group of the dearomatized rings, the dimeric nature of complexes being mantained upon protonation.