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Beilstein J. Org. Chem. 2016, 12, 825–834, doi:10.3762/bjoc.12.81
Graphical Abstract
Scheme 1: Synthesis of dihydroindeno[1,2-c]pyran-3-ones 2 and 3.
Figure 1: Possible isomers of dihydroindeno[1,2-c]pyran-3-ones 2 and 3.
Figure 2: 1H NMR spectra (600 MHz, CDCl3) of isomers 2'b (top), 2''b (middle) and 3''b (bottom).
Figure 3: Normalized absorption spectra of dihydroindenopyrones 2'a–d, 2''b–d and 3''b, recorded in acetonitr...
Figure 4: Normalized UV–vis (left) spectra at excitation wavelengths and fluorescence (right) spectra of dihy...
Figure 5: Normalized solid-state and solution (acetonitrile) fluorescence spectra of diastereoisomers 2a–d.
Scheme 2: Synthesis of α-pyrones 4–6.
Figure 6: a) View of the asymmetric unit in the crystal of 6a, shown with 40% probability ellipsoids. b) View...