作者:P. Joseph-Nathan、M. DomÍnguez、D. A. Ortega
DOI:10.1002/jhet.5570210442
日期:1984.7
assignment of the proton chemical shifts of coumarin (1), all monomethoxy derivatives and the six possible dimethoxyl substituted compounds at the aromatic ring was achieved at 60 MHz in a quantitative study utilizing Pr(fod)3 as the shift reagent. It was found that in addition to the complexation at the lactone carbonyl a second interaction of the lanthanide shift reagent occurs when two methoxyl
在使用Pr(fod)3作为位移试剂的定量研究中,香豆素(1),所有单甲氧基衍生物和六种可能的二甲氧基取代的化合物在芳环上的质子化学位移的完全分配是在60 MHz时完成的。已经发现,除了在内酯羰基上的络合之外,当在邻位分布中发现两个甲氧基时,发生镧系元素转移试剂的第二次相互作用。与在Pr(fod)3转移试剂存在下黄酮的数据进行比较,讨论了结果。