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Different than others: Dimeric rhodium(II) carboxylates uniquely catalyze the 6-endo-dig selective hydroamination of propargylguanidines while tranditional π-Lewis acids are typically 5-exo-dig selective (see scheme, oct=octanoate). Furthermore, this represents a new role for RhII to activate alkynes for addition chemistry.
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Gainer et al. (2010) studied this question.
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