Total assignment of 13C and 1H spectra of three isomeric triterpenol derivatives by 2D NMR: an investigation of the potential utility of 1H chemical shifts in structural investigations of complex natural products
作者:William F. Reynolds、Stewart McLean、Janusz Poplawski、Raul G. Enriquez、Laura I. Escobar、Ismael Leon
DOI:10.1016/s0040-4020(01)87309-9
日期:1986.1
heteronuclear shift-correlated spectra are used to totally assign 1H spectra for , , and taraxasteryl acetate (). 1H chemicalshifts are mainly sensitive to local environment and often show values which are characteristic of a particular environment. Knowledge of 1H chemicalshifts and splitting patterns also places useful constraints on assignment of 13C chemicalshifts for 13C1Hn units. It is strongly recommended