反应详情

Prepared by refluxing 9-hydroxy-1-oxo-1H-naphtho[2,1-b]pyran-2-carboxaldehyde acetate (20.0 g, 0.071 m) in formic acid (250 ml, 88%) for 18 hrs. The product which crystallizes on cooling is filtered, washed with water, with acetone and sucked dry. The crystals are red-brown (16.0 g, 94%), m.p. dec>270° C.

1. customPrepared
2. customThe product which crystallizes
3. temperatureon cooling
4. filtrationis filtered
5. washwashed with water, with acetone
6. customsucked dry
7. custom(16.0 g, 94%), m.p. dec>270° C.