Water → HCID 86742663, compound

Participants

Reaction Steps

To a suspension of 4.2 g 4-chloro-3-formyl-flav-3-ene in 10 ml pyridine is added a solution of 2.6 g 2,5-dihydroxy-1,4-dithian and 2.2 g triethylamine in 11 ml pyridine. After overnight stirring one adds slowly 100 ml water and the precipitate is collected, washed with water, dried, and crystallized in absolute ethanol. Pure 4H-4-phenyl-thieno[3,2-c][1]benzopyran-2-carboxaldehyde is obtained; m.p. 117°-118° C.

Provenance & Evidence