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A drastically enhanced stability is observed for organoazides (RN3) in the presence of Cu2+ or Pd2+ when the azido group is included in a ligand system chelating the transition metal ions. X-ray structure analysis of such complexes (the structure of a cyclohexaneazide palladium complex is depicted) confirms that the alkylated nitrogen atom of the N3 moiety is coordinated to the transition metal center.
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Barz et al. (1998) studied this question.
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