关键词: 反应机理, 碳13核磁共振谱法, 葡萄糖, 质子磁共振谱法, 糖苷, 半乳糖, 结构分析, 乙酰化, 乙酰基

Selective acetylation of aryl D-gluco- and galactopyranosides was reported. By comparing 1H NMR spectra of tri- and tetra-O-acetyl-C-aryl-D-glucopyranosides, it was shown that the hydroxy group at 2'-C position was not acetylated in the triacetate. In addition, when H NMR spectra were used to assign the configuration of tri-O-acetyl-b-C-aryl-D-galactopyranosides, the results did not follow the common rule. But 13C NMR spectra could give the correct results. A possible mechanism was proposed.

Key words: REACTION MECHANISM, C13 NMR SPECTROMETRY, GLUCOSE, PROTON MAGNETIC RESONANCE SPECTROMETRY, GLYCOSIDE, GALACTOSE, STRUCTURAL ANALYSIS, ACETYLATION, ACETYL GROUP