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A new and straightforward method to construct 1H-benzo[d]imidazole was developed by means of PdII-catalyzed intramolecular CH activation starting from easily available N-phenylbenzimidamide (see scheme). The detailed mechanism studies indicated that a palladacycle monomer or dimer is the key intermediate for this transformation and thiourea was used for the first time to promote the efficiency of CH activation.
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Xiao et al. (2009) studied this question.
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