반응 #93822

반응 방정식

benzaldehyde

4-carboxybenzaldehyde

pyrrole

→

4-(10,15,20-triphenyl-21H,23H-porphin- 5-yl)benzoic acid

용매

propionic acid

반응 조건

후처리

1. 1
   기타the mixture obtained
2. 2
   온도is subsequently heated
3. 3
   온도under reflux for about 30 minutes
4. 4
   workup.WAITleft
5. 5
   기타The porphine derivative is precipitated by the addition of 0.5 l of water
6. 6
   기타The filtered-off crude product is pre-purified by two-fold column chromatography on 1.2 kg of silica gel, in each case
7. 7
   세척the elution
8. 8
   기타For the further purification
9. 9
   여과filtered off
10. 10
    기타The thus-obtained product is then chromatographed on a silica gel column

실험 절차

15.2 ml of benzaldehyde and 7.51 g of 4-carboxybenzaldehyde are dissolved in 746 ml of boiling propionic acid, treated dropwise with 13.9 ml of pyrrole, the mixture obtained is subsequently heated under reflux for about 30 minutes and then left to cool to room temperature. The porphine derivative is precipitated by the addition of 0.5 l of water. The filtered-off crude product is pre-purified by two-fold column chromatography on 1.2 kg of silica gel, in each case the elution being carried out with the following solvents in sequence: chloroform/cyclohexane (1:1), chloroform/ethyl acetate (3:2) and (1:1), ethyl acetate and ethyl acetate which contains 2% methanol. For the further purification, the product is suspended in a small amount of methanol and filtered off. This procedure is repeated until the filtrate is only faintly coloured. The thus-obtained product is then chromatographed on a silica gel column using chloroform, chloroform/ethyl acetate (1:1) and ethyl acetate as the elution agent. There are obtained 1.7 g of 4-(10,15,20-triphenyl-21H,23H-porphin- 5-yl)benzoic acid as violet crystals.

출처