試題詳解

20. Predict the compound from the spectral data given. C₉H₁₀O₂: ¹³C NMR, δ 18.06 (quartet), 45.40 (doublet), 127.32 (doublet), 127.55 (doublet), 128.61 (doublet), 139.70 (singlet), 180.98 (singlet); IR, broad 3500-2800, 1708 cm^-1
(A) 3-Phenylproponic acid
(B) 2-Phenylproponic acid
(C) 2-(4-Methylphenyl)acetic acid
(D) 2-(3-Methylphenyl)acetic acid
(E) 2-(2-Methylphenyl)acetic acid