1H chemical shifts in NMR. Part 24—proton chemical shifts in somegem-difunctional compounds: 3-endo- and 3-exo-substituted norbornanones
作者:Gisele F. Gauze、Ernani A. Basso、Mateus G. Campos、Roberto Rittner、Raymond J. Abraham
DOI:10.1002/poc.1094
日期:2006.6
The complete assignment of the 1H and 13C NMR chemical shifts, from 2D techniques and spectra recorded at 500 MHz, for 3-substituted norbornanones with Cl, Br, I, SMe and SeMe substituents at endo and exo positions and 3-exo-hydroxynorbornanone is reported. The observed 1H chemical shifts are compared with the corresponding calculated values using the semi-empirical CHARGE method and ab initio calculations
所述的完整分配1 H和13角C NMR化学位移,从2D技术和光谱在500MHz记录,3 -取代的氯,溴,I,SME和SEME取代基norbornanones在内切和外切的位置和3-外型-据报道有羟基降冰片烷酮。使用半经验CHARGE方法和从头算将观察到的1 H化学位移与相应的计算值进行比较在B3LYP / 6–311 ++ G(d,p)理论水平上进行计算。分子几何结构是通过密度泛函理论(DFT)方法获得的。观察到实验值与两组计算值之间的良好一致性,并且CHARGE计算对于该系列更为准确。这说明CHARGE程序可用于化学位移分配,也可用于阐明化学结构。版权所有©2006 John Wiley&Sons,Ltd.