Method. A solution of IC1 (24.3 g, 150 mmol) in 60 mL of glacial acetic acid was added dropwise to a stirred solution of the appropriate salicylaldehyde (2-6) in 60 mL of glacial acetic acid. After the addition was completed, the dark mixture was heated for 4 h and then stirred at room temperature overnight. The reaction mixture was poured into 500 mL of water, and the product was extracted with two portions of methylene chloride. The ...
