C. Roehri-stoeckel et al., Synthetic dyes: simple and original ways to 4-substituted flavylium salts and their corresponding vitisin derivatives, CAN J CHEM, 79(7), 2001, pp. 1173-1178
Citations number
20
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Chemistry
Journal title
CANADIAN JOURNAL OF CHEMISTRY-REVUE CANADIENNE DE CHIMIE
Flavylium salts substituted at the 4-position have been prepared according
to a Grignard reaction of some flavones with appropriate alkyl- and aryl-ma
gnesium bromides. Among these compounds, 4-methyl flavylium salts were gent
ly reacted with aromatic aldehydes, affording new anthocyanidin pigments, s
ome of which are of the vitisin family. These are the first examples of che
mically synthesized vitisidins (aglycones of vitisins). Compared to the mor
e common flavylium salts, they demonstrate a large bathochromic shift (from
about 100-200 nm), thus providing blue-violet and green colours, so diffic
ult to obtain with anthocyanidins in general.