2-[3-Cyano-4,5,5-trimethylfuran-2(5H)-ylidene]malononitrile → 2-[4-[2-[2-(tert-butyldiphenylsiloxy)-4-dibutylaminophenyl]vinyl]-3-cyano-5,5-dimethyl-2(5H)-furanylidene]propanedinitrile

Participants

Reaction Conditions

Reaction Steps

In 5 ml of ethanol were dissolved 200 mg (0.41 mmol) of 2-(tert-butyldiphenylsiloxy)-4-dibutylaminobenzaldehyde and mg (0.45 mmol) of 2-(3-cyano-4,5,5-trimethyl-2(5H)-furanylidene)propanedinitrile. After the mixture was stirred with heating at 60° C. for 3 hours, the precipitate was separated by filtration and washed with methanol. The crystal was purified by silica gel column chromatography and washed with methanol to give 199 mg of a dark brown crystal having a mp of 220-221° C. (yield: 72.6%).

Provenance & Evidence