Pinacolone → 5-(4-Chlorophenyl)-2,2-dimethylpent-4-en-3-one

Beteiligte Stoffe

Reaktionsschritte

4-Chlorobenzaldehyde (140.5 g) and pinacolone (100 g) in industrial methylated spirit (IMS; 200 ml) were added dropwise over 25 minutes to sodium hydroxide (40 g) in water (70 ml) and IMS (150 ml) with external cooling (ice/water) applied to maintain a temperature of not more than 25°. The resulting creamy suspension was stirred for a further 3 hours at 18° and was then filtered. The residue was washed with aqueous IMS and dried to give 4-chlorobenzal pinacolone, m.p. 83°-84°. The filtrate was concentrated under reduced pressure and allowed to stand for 2 days to give more of the chalcone product, m.p. 83°-84°.

Herkunft & Nachweise