作者:Choji Kashima、Hiromu Aoyama、Yasuhiro Yamamoto、Takehiko Nishio、Kazutoshi Yamada
DOI:10.1039/p29750000665
日期:——
The n.m.r. spectra of the four geometrical isomers of β-aminoenones, trans-s-trans, trans-s-cis, cis-s-trans, and cis-s-cis, are discussed. It was found that the chemical shift of the α-proton of β-aminoenones depends on both anisotropic effects and the electron density: δ=δ0–Δδstruc=ΔδAr+K(q–q0). Thus the conformation of non-rigid β-aminoenones can be determined from the observed and the calculated
β-aminoenones的四个几何异构体的NMR谱,反式-小号-反式,反式-小号-顺式,顺式-小号-反式,以及顺式-小号-顺式,进行了讨论。据发现,β-aminoenones的α质子的化学位移取决于两个各向异性效应和电子密度:δ=δ 0 -Δδ STRUC =Δδ的Ar + ķ(q - q 0)。因此,可以根据观察到的和计算出的α-质子的化学位移来确定非刚性β-氨基烯酮的构象。