Abstract: This paper deals with studies on the acyl functions and their substitution site in flavonoid glycosides. As an example, the structure of a navonol glycoside with two glucose units, one rhamnose unit and three acetyl groups in the molecule was studied by means of 2D NMR analyses. For the purpose of systematization of research on the acyl fiavonoid glycosides, a summary was made for acyl functions found in flavonoid glycosides and their ¹³C NMR chemical shift. On the other hand, the chemical shift effects of acyl groups in the flavonoid glycosides was analysed.

Key words: Flavonoid glycosides, Acyl functions, Substitution site