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Data was obtained at 120 K with Mo KGk-α radiation by means of the Enraf Nonius KappaCCD area detector diffractometer of the EPSRC crystallographic service, based at the University of Southampton. Data collection was carried out under the control of the program COLLECT17a and data reduction and unit cell refinement were achieved with the COLLECT17a and DENZO programs.17b Correction for absorption, by comparison of the intensities of equivalent reflections, was applied using the program SADABS.17c The program ORTEP-3 for Windows17d was used in the preparation of Figure 3 and SHELXL-9717e and PLATON17f in the calculation of molecular geometry. The structure was solved by direct methods using SHELXS-9717g and fully refined by means of the program SHELXL-97.17e In the final stages of refinement, hydrogen atoms were introduced in calculated positions and refined with a riding model
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17e In the final stages of refinement, hydrogen atoms were introduced in calculated positions and refined with a riding model.
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49
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General Procedure for 2H-Chromenes 7-10: A mixture of the naphthoquinone (0.02 mol, allyltriphenylphosphonium salt (0.04 mol, CHCl3 (15 mL) and aq 50% NaOH (15 mL, 0.19 mol) was vigorously stirred for 48 h at r.t. The organic phase was collected, washed with H 2O (3 x 10 mL, dried over MgSO4 and the solvent was evaporated. Purification of the crude product was achieved by flash column chromatography using hexane-CH2Cl2 as eluent. 6-Methoxy-3,3-dimethyl-3H-benzo[f]chromene (7a, IR (KBr, 2971, 2938, 1634, 1588, 1574, 1515, 1464, 1450, 1443, 1411, 1379, 1351, 1283, 1247, 1220, 1207, 1199, 1160, 1130, 1119, 1092, 996, 981, 885, 841, 755, 727, 694, 626 cm-1. 1H NMR (300 MHz, CDCl 3, δ, 1.50 (s, 6 H, Me, 3.98 (s, 3 H, OMe, 5.58 (d, J, 9.8 Hz, 1 H, H-2, 6.48 (s, 1 H, H-5, 6.95 (d, J, 9.8 Hz, 1 H, H-1, 7.30 ddd
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3): δ = 19.0 (Me), 26.4 (Me), 30.0 (C-3), 111.0 (C-1), 112.9 (C-5), 118.3 (C-2), 125.1 (C-8a), 126.0 (C-7), 128.0 (C-6), 144.9 (C-8), 146.7 (C-4a).
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