13C Nuclear magnetic resonance spectroscopy of 4-methylcoumarins (4-methyl-2H-1-benzopyran-2-ones)
作者:V. S. Parmar、S. Singh、P. M. Boll
DOI:10.1002/mrc.1260260515
日期:1988.5
The 13C NMR spectra of 36 differently substituted 4-methylcoumarins (4-methyl-2H-1-benzopyran-2-ones) have been recorded. The effects of an alkyl side-chain at C-3 on the chemical shift values and that of a methoxy or an acetoxy group in place of a hydroxy group have been observed and rationalized. This study may be helpful in the structure elucidation of new and natural 4-methylcoumarins.
对36种不同取代的4-甲基香豆素(4-甲基-2H-1-苯并吡喃-2-酮)的13C核磁共振谱进行了记录。观察并合理化了C-3位上的烷基侧链对化学位移值的影响,以及用甲氧基或乙酰氧基取代羟基的影响。这项研究可能有助于新发现及天然4-甲基香豆素的结构解析。