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Three in one: Nickel-catalyzed three-component cycloaddition reactions of readily available arynes, activated alkenes, and alkynes gave a series of substituted 1,2-dihydronaphthalenes in moderate to very good yields with excellent chemo- and regioselectivity (see scheme, TMS=trimethylsilyl, cod=1,5-cyclooctadiene).
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Qiu et al. (2009) studied this question.
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