Cyclopentanone → 2,5-Bis(4-diethylaminobenzylidene)cyclopentanone

Participants

Reaction Steps

About 110 g of p-diethylaminobenzaldehyde were dissolved in a solution of 80 g of potassium hydroxide in 1000 mL of methanol. About 26 g of cyclopentanone were added with stirring and the reaction mixture was heated under reflux on a steam bath for 3 hr. After chilling in the freezer, a solid precipitate was collected, washed with alcohol and recrystallized from a mixture of alcohol and acetonitrile. The title compound was confirmed by its NMR spectrum. This dye has an ε488 /MW of 188.

Provenance & Evidence