반응 #2666

반응 방정식

5-nitro vanillin

boron tribromide

→

expected product

수율 55.4%

3-nitro-4,5-dihydroxy benzaldehyde

수율 55.4%

용매

dichloromethane

dichloromethane

반응 조건

후처리

1. 1
   농축was concentrated
2. 2
   workup.WAITleft for 16 hours at ambient temperature
3. 3
   추출Extraction
4. 4
   세척the organic phase was washed
5. 5
   기타dried
6. 6
   농축concentrated

실험 절차

35 g of 5-nitro vanillin (commercial) and 1200 ml of dichloromethane were mixed together under nitrogen and the mixture was cooled to 0° C. 533 ml of a molar solution of boron tribromide in dichloromethane were added and the mixture stood for 2 days at abmient temperature and then was concentrated. The residue was taken up cold (ice bath+methanol) in 300 ml of 2N hydrochloric acid and the mixture was stirred for two to three hours at this temperature, then left for 16 hours at ambient temperature. Extraction was carried out with ethyl acetate and the organic phase was washed, dried and concentrated to obtain 18 g of the expected product melting at >260° C.

출처