¹H and ¹³C chemical shift assignments of homoisoflavanones

Abstract

Abstract 13 C chemical shifts of various homoisoflavanones were assigned, mainly on the basis of long‐range heteronuclear 2D NMR shift correlation experiments and of long‐range proton‐carbon coupling constants. In addition, 1 H chemical shift data are reported. Some general relationships between substitution patterns and nuclear shielding, useful for the identification of naturally occurring homoisoflavanones, are discussed.