反应详情

A solution containing 1.83 g of 3,4-dihydroxy-5-nitrobenzaldehyde and 1.00 g of 2,4-pentanedione in 10 ml of tetrahydrofuran was saturated with gaseous hydrogen chloride. After standing over night at 5° C. the product was filtered and washed with ether. Yield 1.2 g (50%), m.p. 175°-178° C.

1. waitAfter standing over night at 5° C.
2. filtrationthe product was filtered
3. washwashed with ether