[CH:1](Br)=[CH2:2].[Mg].[Cl:5][C:6]1[CH:19]=[CH:18][C:9]([C:10]([C:12]2[CH:13]=[N:14][CH:15]=[CH:16][CH:17]=2)=[O:11])=[CH:8][CH:7]=1.[Cl-].[NH4+]>O1CCCC1.O>[Cl:5][C:6]1[CH:19]=[CH:18][C:9]([C:10]([C:12]2[CH:13]=[N:14][CH:15]=[CH:16][CH:17]=2)([OH:11])[CH:1]=[CH2:2])=[CH:8][CH:7]=1A solution of vinylbromide (38.4 g, 359 mmol) in 100 ml tetrahydrofuran was added to a mixture of magnesium (9.15 g, 377 mmol) in 40 ml tetrahydrofuran under a nitrogen atmosphere at 50° to 60° C. After reflux for 1 h 3-(4-chlorobenzoyl)pyridine (62.4 g, 287 mmol) in 250 ml tetrahydrofuran was added at 10° C. After stirring for 1 h a solution of 20 g ammonium chloride in 100 ml water was added and the mixture filtered. The organic phase was evaporated and the residue taken up in ether and treated with charcoal. After filtration the solvent was evaporated to give 62.6 g (89%) of a brownish oil which solidified. Recrystallisation from toluene gave a product having m.p. 82.5°-84° C.
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