potassium hydroxide in ethanol; water 2 h; Ambient temperatureReaction with other aldehydes.;

1: potassium carbonate / N,N-dimethyl-formamide / 3 h / 70 °C 2: potassium hydroxide / water; ethanol / 20 °C 3: boron trichloride / dichloromethane / 2 h / 0 °C View Scheme

1: potassium hydroxide / water; ethanol / 20 °C 2: boron trichloride / dichloromethane / 2 h / 0 °C View Scheme

alcoholic alkali

potassium carbonate in acetone 12 h; Heating;

1: (E)-1-(3-hydroxyphenyl)-3-phenylprop-2-en-1-one With triphenylphosphine; Wang resin; diethylazodicarboxylate in tetrahydrofuran T=0 - 20°C; Mitsunobu reaction; 16 h; 2: heptanal With triethylamine; 5-CH2CH2OH-4-Me-3-Bn-C3HSN(1+)*Cl(1-) in 1,4-dioxane; ethanol Stetter reaction; 30 h; Heating; 3: With trifluoroacetic acid in dichloromethane