Hydrogen Bromide → HCID 343262, compound

Participants

Reaction Steps

The acetate (21) was dissolved in 60 mL of 31% HBr in HoAc and refluxed for 4 hours. After cooling, all the solvent was removed in vacuo. The resulting black residue was suspended in a mixture of CH2Cl2 and dilute aqueous NaHCO3. Four 200 mL CH2Cl2 extracts removed the desired bromide from the insoluble material floating at the solvent interface. After drying over Na2SO4 and removal of the solvent, the dark residual solid was relatively pure phenanthroline (22) containing a trace amount of 2,9-dimethyl-1,10-phenanthroline. The dark impurities were removed by chromatography on silica gel using CH2Cl2 as the eluent which gave 3.5 g (42%) of 22. 1H NMR (CDCl3) 2.9 (s, 3H); 4.94 (s, 2H), 7.43 (ABq, 1H, J=9 Hz), 7.6 (s, 2H); 7.8 (ABq, 1H, J=9 Hz); 7.97 (ABq, J=9 Hz); 8.1 (ABq, 1H, J=9 Hz).

Provenance & Evidence