这个结构? - q' R9 v' O7 G) ]
Terephthalic 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) ( e& N0 K. z- ]$ ?: i
4 o, @& N; V2 z3 @& H; Q6 U
[此贴子已经被作者于2009-11-8 15:38:57编辑过] # c" C& I: y6 c$ W3 e
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