Reaction #2006433

Reaction equation

4-bromo-2,2′-bipyridyl-N-oxide

PCl3

→

4-bromo-2,2′-bipyridyl

Yield 85.0%

Solvents

CHCl3

Conditions

Workup

1. 1
   Otherat room temperature
2. 2
   TemperatureThe mixture was refluxed for 2 h under N2
3. 3
   OtherThe aqueous layer was separated
4. 4
   ExtractionThe CHCl3, layer was extracted three times with H2O (3×60 mL)
5. 5
   FiltrationThe resulting white precipitate was collected by suction filtration
6. 6
   Washwashed with H2O (30 mL)
7. 7
   Otherdried under vacuum at 50° C. for 24 h

Procedure

To a stirred suspension of 4-bromo-2,2′-bipyridyl-N-oxide in 60 mL CHCl3, was added 12 mL PCl3, at room temperature. The mixture was refluxed for 2 h under N2 and then cooled to room temperature. The reaction mixture was poured into 100 mL ice/water. The aqueous layer was separated and saved. The CHCl3, layer was extracted three times with H2O (3×60 mL) and then discarded. The combined aqueous solution was neutralized with NaHCO3 powder to about pH 7-8. The resulting white precipitate was collected by suction filtration, washed with H2O (30 mL) and then dried under vacuum at 50° C. for 24 h. Yield: 85%.

Source