NiCl2·6H2O and Ni(OAc)2·4H2O were found as efficient catalysts for C-H activation of benzyl and aliphatic amines for an unprecedented multi C-N bond forming cyclization with 1,2-diketones under refluxing toluene to furnish highly substituted and polycyclic imidazoles.
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Samanta et al. (2013) studied this question.
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