A.-S. Castanet et al. / Tetrahedron: Asymmetry 13 (2002) 659–665
665
bined organic phases were dried with magnesium sul-
fate. The drying agent was filtered off and solvents were
removed under reduced pressure. The crude material
was purified by flash chromatography on silica gel
(hexane/dichloromethane, 5/5).
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4.10.1. 2,2%-Dimethoxy-1,1%-dinaphthalene. 1H NMR
(200 MHz, CDCl3) l=3.77 (s, 6H, OCH3), 7.08–7.36
3
(m, 6H, ar. H), 7.46 (d, 2H, J=9.3 Hz, ar. H), 7.87 (d,
3
3
2H, J=7.3 Hz, ar. H), 7.98 (d, 2H, J=8.8 Hz, ar. H);
13C NMR (50 MHz, CDCl3) l=57.0 (OCH3), 114.7
(C-H), 120.1 (Cq), 123.9 (C-H), 125.7 (C-H), 126.7
(C-H), 128.3 (C-H), 129.6 (Cq), 129.8 (C-H), 134.4
(Cq), 155.4 (C-O); IR (neat) w=3065(w), 3010(w),
2954(w), 2934(w), 2837(w), 1618(m), 1590(m), 1505(m),
1460(m), 1354(m), 1323(w), 1263(m), 1249(s), 1149(m),
1132(m), 1090(m), 1064(m), 1019(m), 896(m), 805(s),
747(s), 708(w), 679(w).
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