1H and 13C chemical shift assignments of homoisoflavanones

Abstract 13C 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, 1H chemical shift data are reported. Some general relationships between substitution patterns and nuclear shielding, useful for the identification of naturally occurring homoisoflavanones, are discussed.