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J. Braz. Chem. Soc. vol.27 número1

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Figure 1. Structures of dihydrobenzofuran neolignans 2a and 2b.
Figure 2. Expansions of the 1 H NMR spectrum of compounds 2a and 2b obtained in CDCl 3 and acetone-d 6 .
Table 1. 1 H and 13 C NMR data assignments for compound 2a (400 MHz, CDCl 3 ) d C a d H (integral, multiplicity b ), J / Hz 1 132.0 (C) − 2=6 127.5 (CH) 7.27 (2H, ddd, J 2,5 = J 6,3 0.3, J 2,7 = J 6,7 0.6, J 2,3 = J 6,5 8.3) 3=5 115.7 (CH) 6.84
Table 3. 1 H and 13 C NMR data assignments for compound 2b (400 MHz, acetone-d 6 ) d C a d H (integral, multiplicity b ); J / Hz 1 132.5 (C) – 2 111.2 (CH) 7.10 (1H, ddd, J 2,5 0.3, J 2,7 0.8, J 2,6 2.1) 3 149.1 (C) – 4 148.5 (C) – 5 116.3 (CH) 6.84
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