It is worth noting that the substitution pattern ( ortho -, meta -, or para -) had a slightly significant effect on the reaction yields (e.g., 2′ , 3′ , and 6′ ), and some variability in selectivity was observed (with ratios ranging from 2:98 to 12:88).
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Regiodivergent Cyclotrimerization of Alkynes: Switchable Selectivities by Iron and Nickel Catalysts.
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