1H and13C NMR study of stereoisomers of 3-(arylpropenylidene)isobenzofuran-1(3H)-ones
作者:Nikolay N. Sveshnikov、Victor I. Nikulin
DOI:10.1002/mrc.1260330912
日期:1995.9
A study of the 1H and 13C NMR spectra of a series of E,E‐ and Z,E‐isomers of 3‐(arylpropenylidene)isobenzofuran‐1 (3H)‐ones [1a–d and 2a–d, respectively] was carried out. The E,E‐ and Z,E‐isomers 1a–d and 2a–d were recognized by the local anisotropy effect of the double and triple bonds of the substituents experienced by H‐4 in E,E‐isomers; in Z,E‐isomers; in contrast to their E,E‐analogues, upfield
对 3-(芳基亚丙烯基)异苯并呋喃-1 (3H)-酮 [分别为 1a-d 和 2a-d] 的一系列 E,E-和 Z,E-异构体的 1H 和 13C NMR 谱进行了研究出去。E,E-和Z,E-异构体1a-d 和2a-d 通过E,E-异构体中H-4 所经历的取代基的双键和三键的局部各向异性效应得到识别;Z,E-异构体;与它们的 E、E 类似物相比,由于 HH γ-顺式效应,观察到 C-4 和 C-8 的高场位移。