Acyl Position Research Articles

Structures of Acylated Anthocyan Pigments in Vitis vinifera variety Tinta Pinheira. II. Position of Acylation

SUMMARYGas chromatographic analysis of the methylated sugar residues obtained from the band‐2 pigment of Vitis vinifera var. Tinta Pinheira indicated that the acyl function, p‐coumaric acid, was most likely attached at the four‐position on the glucose portion of the anthocyanins. The possibility of an acid‐catalyzed migration of the acyl function during the methylation process cannot, however, be ruled out completely. The acylated pigments of band 2 are thus considered to be the 3‐monoglucosides of malvidin, peonidin, petunidin, and delphinidin, each acylated with p‐coumaric acid at the four‐position on the glucose.

The Acylation of β-Keto Esters. Control of the Position of Acylation by Variation of the Acylating Agent and Solvent1a

The Acylation of β-Keto Esters. Control of the Position of Acylation by Variation of the Acylating Agent and Solvent^1a