4.6 g. of the methoxy compound was heated at reflux for one-half hour with 10 g. of anhydrous aluminum chloride in 60 cc. of chlorobenzene. The mixture was then acidi- fied with hydrochloric acid and the chlorobenzene removed by steam distillation; the excess water was distilled off and the residue allowed to cool, whereupon the anthocyanidin separated from solution. It was recrystallized from dilute alcoholic hydrochloric acid. Summary 1. The familiar reactions ...
[Stamm, Helmut; Assithianakis, Petros; Weiss, Rainer; Bentz, Gunther; Buchholz, Berthold Journal of the Chemical Society, Chemical Communications, 1984 , # 12 p. 753 - 754]