Metal Complexes with an Intact, Coordinating and Linear Organoazide Ligand

5 Metal Complexes with an Intact, Coordinating and Linear Organoazide Ligand 

The discussion in Sections 12.2-12.4 should make it clear that preventing a metal mediated decomposition of an organoazide can be realized by hindering any interaction between the N3 unit and the metal site. However, coordination of the organoazide must not obligatorily result in decomposition at all. There are several structurally characterized compounds in the literature, which allow to demonstrate the strategies to prevent this. 

While the copper(II) complex is completely stable in the solid state and in solution, the palladium(II) compound decomposes slowly in dichloromethane solution to give the corresponding complex with an amine (-NH2) function in the position of the azide (-N3). The azide unit of the palladium complex is still capable of undergoing slow [2-i-3]-cycloaddition with EtOOC-C=C-COOEt to yield the corresponding triazole. However, it is not yet clear whether this is due to decoordination of the azide ligand in solution or whether it takes place at the 77 -coordinated ligand. 

Two even more impressive examples were published two years later by Dias, Marynick, et Reacting [HB(3,5-(CF3)2Pz)3]Na(THF) (Pz = pyrazol-l-yl) with copper(I) trifluo-romethanesulfonate in the presence of 1-azidoadamantane or reacting [HB(3,5-(CF3)2Pz)3] 

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