[CH2:1]([C:3]1[CH:8]=[CH:7][N:6]=[CH:5][CH:4]=1)[CH3:2]>[Pd].[Pt].[Rh].C1C=CC=CC=1>[CH2:1]([C:3]1[CH:8]=[CH:7][N:6]=[CH:5][CH:4]=1)[CH3:2].[CH2:1]([C:3]1[CH:8]=[CH:7][N:6]=[C:5]([C:5]2[CH:4]=[C:3]([CH2:1][CH3:2])[CH:8]=[CH:7][N:6]=2)[CH:4]=1)[CH3:2]
1 gram (g) of 5% or 10% palladium-on-carbon catalyst and 25 milliliters (ml) 4-ethylpyridine are heated for 3 days under reflux while being stirred. (Alternatively, 5% platinum-on-carbon or 5% rhodium-on-carbon may be used as the catalyst.) The reaction mixture is treated with boiling benzene, filtered, and distilled to give benzene, 4-ethylpyridine, and 4,4'-diethyl-2,2'-bipyridine.
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