[N+:1]([C:4]1[CH:21]=[CH:20][C:7]([C:8]([C:10]2[CH:17]=[C:16]([O:18][CH3:19])[CH:15]=[CH:14][C:11]=2[CH:12]=O)=[O:9])=[CH:6][CH:5]=1)([O-:3])=[O:2].[Cl-].[CH3:23][O:24][CH2:25][P+](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1.O.Cl>C1(C)C=CC=CC=1>[CH3:23][O:24][CH:25]=[CH:12][C:11]1[CH:14]=[CH:15][C:16]([O:18][CH3:19])=[CH:17][C:10]=1[C:8](=[O:9])[C:7]1[CH:20]=[CH:21][C:4]([N+:1]([O-:3])=[O:2])=[CH:5][CH:6]=110 g of 2-(4-nitrobenzoyl)-4-methoxybenzaldehyde is introduced together with 18 g of (methoxymethyl)triphenylphosphonium chloride in 400 ml of toluene and mixed in portions with 5.9 g of potassium-tert-butylate while being cooled with ice. After 1 hour of stirring while being cooled with ice and a subsequent 3.5 hours of stirring at room temperature, it is mixed with 200 ml of water, weakly acidified with 1N hydrochloric acid and extracted three times with ethyl acetate. The ethyl acetate phases are washed with saturated common salt solution, dried, filtered and concentrated by evaporation. The residue is chromatographed on silica gel with hexane:ethyl acetate=1:1 as an eluant. 6.9 g of 1-methoxy-2-(4-methoxy-2-(4-nitrobenzoyl)phenyl)ethylene as a mixture of the E- and Z-forms is obtained.
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