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Chalcogenoalkynes and o‐alkynylbenzaldehydes reacted in the presence of copper(II) salt to give the [4+2] cycloadducts 2‐chalcogeno‐1‐halonaphthalenes in good yields (46–89 %) and high regioselectivities. The methodology was carried out by using CuCl2 or CuCl2/LiBr in 1,2‐dichloroethane (DCE) at 80 °C. The potential and generality of this system was evaluated by using a variety of chalcogenoalkynes...
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