8-hydrazinylquinoline hydrochloride Chemische Eigenschaften,Einsatz,Produktion Methoden
synthetische
the original preparation of 8-Hydrazinoquinoline (8-HQ) involved the diazotization of commercially
available 8-aminoquinoline followed by reduction with tin(II) chloride.
[1] An improved one-step method has
been developed which starts with the less expensive 8-hydroxyquinoline.
[2] Sulfur dioxide (10 g) is
dissolved in hydrazine hydrate (80 mL), 8-hydroxyquinoline (10.16 g) is added and the mixture is refluxed
for 7 d. Every 48 h, EtOH (10 mL) is added to dissolve any starting material which may have sublimed into
the condenser. The mixture is cooled, 2 M NaOH (100 mL) is added, and the resulting emulsion is
extracted with CHCl3 (4 × 75 mL). The combined organic layers are washed with brine (20 mL), dried over
MgSO4, and concentrated. The residue crystallizes upon standing and may be recrystallized from CH2Cl2
and pentane to afford 8.7 g (78%) of 8-HQ as pale yellow needles (eq 1).
8-hydrazinylquinoline hydrochloride Upstream-Materialien And Downstream Produkte
Upstream-Materialien
Downstream Produkte
