The synthesis of ester derivatives of substituted 7-hydroxychromylium chlorides and investigation of their properties

Anthocyanins are natural plant pigments : they are glycosides and theiraglycons, i.e., the sugar-free pigments, are known as the anthocyanidins. Thefundamental nucleus in anthocyanidins is benzopyrylium chloride(or chromyliumchloride), but the parent compounds is flavylium chloride.Benzopyrylium salts with 2-phenyl groups are known as flavylium salts. Thepolyhydroxyflavylium salts constitute the naturally occurring anthocyanins which areresponsible for the red and blue colors in flowers and fruits.Phenols condense with coumarin in the presence of phosphorus oxychloride togive o-hydroxychalcones wich can be cyclized to flavylium salts by acids.In this study, firstly coumarins which include ester groups have been derived,then, these products have been condensed with resorcinol and transformed intoflavylium salts by treatment with acid.Keywords : Anthocyanins, Anthocyanidins, Flavylium Salts.