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(a) Evaluation of the influence of the nickel loading on the ratio of uncyclized and cyclized products. Reactions performed in the optimized conditions (as in Table 1, entry 1), varying the loading of nickel. (b) Evaluation of the influence of the nature of the aryl bromide on the ratio of uncyclized and cyclized products. Reactions performed in the optimized conditions (as in Table 1, entry 1) with 2.5 mol % of Ni II.
