这个结构?
: I. c% [ B( @0 N6 s6 A% I2 uTerephthalic acid dimethyl ester (1a): 1H NMR (CDCl3): 3.95 (s, 6H, -OCH3), 8.10 (m, 4H, HAr); 13C NMR (CDCl3): 52.4 (-O-CH3), 129.5 (CH Ar), 133.9 (C Ar), 166.2 (C=O) - z1 D- A; C1 n" P$ e6 [: n6 O6 |
4 _3 V5 E4 U% u8 {5 x/ R[此贴子已经被作者于2009-11-8 15:38:57编辑过] ! }/ r% A, i7 \# Z
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