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Synthesis of 4H-chromenes

Recent Literature

A Cu(I)-catalyzed domino reaction between bromobenzyl bromides and β-ketoesters exclusively yields either 4H-chromenes or naphthalenes depending on the ratio of the substrates and the reaction conditions.
C. C. Malakar, D. Schmidt, J. Conrad, U. Beifuss, Org. Lett., 2011, 13, 1972-1975.