| α—苯丙酮酸和β—苄基—α—苯丙酮酸光谱性质研究 |
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| 引用本文： | 李光兴 李琳. α—苯丙酮酸和β—苄基—α—苯丙酮酸光谱性质研究[J]. 光谱学与光谱分析, 2003, 23(1): 123-126 |
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| 作者姓名： | 李光兴 李琳 |
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| 作者单位： | 华中科技大学化学系 湖北武汉430074(李光兴)，华中科技大学化学系 湖北武汉430074(李琳) |
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| 摘 要： | 研究了α-苯丙酮酸（PPA）和β－苄基－α－苯丙酮酸（BPPA）的UV，IR，MS和^1H NMR等光谱学性质，UV光谱中，PPA在240和365nm处出现吸收峰，BPPA只在210nm处有吸收，这证明PPA存在烯醇式结构而BPPA则没有。IR光谱中，PPA由于采取烯醇式二聚体结构，在1624．38和1697．25cm^-1处分别出现两个羟基C＝0峰，BPPA则在1706．6cm^-1和1728．6cm^-1处分别出现酮基C＝0和羧基C＝0吸收峰。同时还对MS及S^1H NMR图谱进行了详尽的解析，并就两者化学结构上的差异进行了比较说明。
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| 关 键 词： | α－苯丙酮酸和β 苄基－α－苯丙酮酸 光谱性质研 光谱表征 |
| 文章编号： | 1000-0593(2003)01-0123-04 |
| 修稿时间： | 2001-11-09 |
Characterization of phenylpyruvic acid and beta-benzyl phenylpyruvic acid by UV, IR, MS, and 1H NMR] |
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| LI Guang-xing and LI Lin. Characterization of phenylpyruvic acid and beta-benzyl phenylpyruvic acid by UV, IR, MS, and 1H NMR][J]. Spectroscopy and Spectral Analysis, 2003, 23(1): 123-126 |
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| Authors: | LI Guang-xing and LI Lin |
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| Affiliation: | Department of Chemistry, Huazhong University of Science and Technology, Wuhan 430074, China. |
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| Abstract: | 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. |
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