Hydrochloric Acid → 3,7-Dihydroxyflavylium chloride
Reaction equation
[OH:1][C:2]1[CH:9]=[C:8]([OH:10])[CH:7]=[CH:6][C:3]=1[CH:4]=O.C([O:14][CH2:15][C:16]([C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1)=O)(=O)C.[ClH:24]>C(OCC)(=O)C>[Cl-:24].[OH:14][C:15]1[C:16]([C:18]2[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=2)=[O+:1][C:2]2[C:3]([CH:4]=1)=[CH:6][CH:7]=[C:8]([OH:10])[CH:9]=2Participants
5
Reactant 3
Product 1
Reagents, catalysts & solvents 1
Procedure
79 g of 2,4-dihydroxybenzaldehyde were dissolved at room temperature in 800 ml of anhydrous ethyl acetate and 106 g of omega-acetoxyacetophenone were added to the solution. The reaction mixture was brought to 0° C. under agitation and gaseous hydrochloric acid added to saturation. After standing for 24 hours at room temperature, crystallisation of the product began and it was filtered and dried at 40° C. in the presence of NaOH. There were obtained 95 g of 3,7-dihydroxyflavilium chloride.