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Beilstein J. Org. Chem. 2013, 9, 2120–2128, doi:10.3762/bjoc.9.249
Graphical Abstract
Scheme 1: Synthesis of 3-halo-2H-chromenes.
Figure 1: X-ray molecular structure of 2f.
Scheme 2: Gram-scale synthesis of 2f.
Scheme 3: Retaining propargylic chirality.
Scheme 4: Mechanistic basis postulated for the synthesis of 2.