1,3-Indandione → 2-(3,4-dichlorobenzylidene)-1H-indene-1,3(2H)-dione

Participants

Reaction Steps

To a solution of indan-1,3-dione (1a) (960 mg, 6.6 mmol) in EtOH (8.2 mL) was added 3,4-dichlorobenzaldehyde (1b) (1.3 g, 7.2 mmol) followed by piperidine (3 drops). The reaction mixture was heated to reflux for 30 min. After cooling, the reaction was diluted with EtOH (8 mL) and the precipitate was filtered. The resulting solid was triturated twice with EtOH and dried under high vacuum to give 2-(3,4-dichloro-benzylidene)-indane-1,3-dione (1c) (1.7 g, 82% yield).

Provenance & Evidence