[Characterization of phenylpyruvic acid and beta-benzyl phenylpyruvic acid by UV, IR, MS, and 1H NMR].
Characterization of phenylpyruvic acid (PPA) and beta-benzyl phenylpyruvic acid (BPPA) by UV, IR, MS and 1H NMR has been carried out. It is found that the absorption at 240 and 365 nm are observed in the UV spectrum of PPA and the absorption at 210 nm is the only one in BPPA. These demonstrate that PPA has the olefinic alcohol structure and BPPA hasn't. The IR absorption at 1,624.38 and 1,697.25 cm-1 of PPA are originated from two carboxy C=O because of its gem-diol structure, and the absorption at 1,706.6 and 1,728.6 cm-1 in BPPA is assignable to keto C=O and carboxy C=O, respectively. The main peaks in the MS spectrum of PPA are 164, 119, 91, 65, 45, 39, and BPPA 254, 236, 209, 181, 91, 77, 65, 39. The peaks at 4.124, 6.381, 7.184-7.748, 9.268 are observed in the 1H NMR spectrum of PPA and the peaks in BPPA are 2.90-3.02, 3.29-3.40, 4.73-4.81, 7.04-7.44, 8.99.
Li
Guang-xing
GX
Department of Chemistry, Huazhong University of Science and Technology, Wuhan 430074, China.
Li
Lin
L
D001593:Benzyl Compounds / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D010667:Phenylpyruvic Acids / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet
D001593:Benzyl Compounds; D010667:Phenylpyruvic Acids; C487676:beta-benzyl phenylpyruvic acid; C031606:phenylpyruvic acid