Synthetic dyes: simple and original ways to 4-substituted flavylium salts and their corresponding vitisin derivatives

Autor:	Raymond Brouillard, Andre Fougerousse, Christine Roehri-Stoeckel, Emmanuel Gonzalez
Rok vydání:	2001
Předmět:	chemistry.chemical_classification chemistry.chemical_compound chemistry Simple (abstract algebra) Organic Chemistry Grignard reaction Organic chemistry General Chemistry Flavones Catalysis Alkyl
Zdroj:	Canadian Journal of Chemistry. 79:1173-1178
ISSN:	1480-3291 0008-4042
DOI:	10.1139/v01-089
Popis:	Flavylium salts substituted at the 4-position have been prepared according to a Grignard reaction of some flavones with appropriate alkyl- and aryl-magnesium bromides. Among these compounds, 4-methyl flavylium salts were gently reacted with aromatic aldehydes, affording new anthocyanidin pigments, some of which are of the vitisin family. These are the first examples of chemically synthesized vitisidins (aglycones of vitisins). Compared to the more common flavylium salts, they demonstrate a large bathochromic shift (from about 100–200 nm), thus providing blue-violet and green colours, so difficult to obtain with anthocyanidins in general.Key words: 4-substituted flavylium chlorides, vitisin aglycones, blue-violet and green anthocyanidin pigments.
Databáze:	OpenAIRE
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