Nickel can oxidize, too! Nickel(II) salts such as nickel chloride and nickel acetylacetonate catalyze the intramolecular diamination of alkenes with urea and guanidine derivatives as well as sulfamides as nitrogen sources. The latter represent particularly attractive starting materials, as they allow for a selective and convenient liberation of the diamines from the oxidation products (see scheme).
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Muñiz et al. (2007) studied this question.
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