[CH:1]([Mg]Br)=[CH2:2].[Cl:5][C:6]1[C:11]([Cl:12])=[CH:10][CH:9]=[CH:8][C:7]=1[N+:13]([O-])=O.[NH4+].[Cl-]>C1COCC1>[Cl:12][C:11]1[C:6]([Cl:5])=[C:7]2[C:8]([CH:1]=[CH:2][NH:13]2)=[CH:9][CH:10]=1800 ml of a 1M solution of vinylmagnesium bromide in THF are cooled to −45° C. under a nitrogen atmosphere, a solution of 51.2 g of 2,3-dichloronitrobenzene in 1000 ml of THF is then added dropwise and the mixture is left stirring at −30° C. for 1 hour. The reaction mixture is poured onto 1000 ml of a saturated NH4Cl solution and extracted with ether, the combined organic phases are washed with water and with a saturated NaCl solution and dried over MgSO4, and the solvents are evaporated under vacuum. The residue is chromatographed on silica gel, elution being carried out with a cyclohexane/EtOAc mixture (95/5; v/v). 27.75 g of the expected compound are obtained.
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