[CH3:1][O:2][C:3]1[CH:4]=[CH:5][CH:6]=[C:7]2[C:12]=1[C:10](=[O:11])[O:9][CH2:8]2.[CH3:13][O:14][C:15]1[CH:16]=[C:17]([CH:20]=[CH:21][CH:22]=1)[CH:18]=[O:19].C1(P(=CC(OC)=O)(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1>C(Cl)(Cl)Cl>[OH:11][CH:10]1[C:12]2[C:3]([O:2][CH3:1])=[CH:4][CH:5]=[CH:6][C:7]=2[CH2:8][O:9]1.[OH:19][CH2:18][C:17]1[CH:20]=[CH:21][CH:22]=[C:15]([O:14][CH3:13])[C:16]=1/[CH:3]=[CH:12]/[C:10]([O:9][CH3:8])=[O:11]1-Hydroxy-7-methoxy-1,3-dihydrobenzo[c]furan (108 g), which was prepared with using 7-methoxyphthalide which was synthesized with using 3-methoxybenzaldehyde by the method described in Journal of Organic Chemistry, 1980, 45, 1835-1838, was dissolved in chloroform (20 ml). Methyl (triphenylphosphoranylidene)acetate (2.68 g) was added to the solution. The mixture was stirred for 40 min. at 50° C. A temperature of the reaction mixture was down to room temperature. The reaction solution was purified by column chromatography on silica gel (n-hexane:ethyl acetate=2:1) to give the title compound (1.25 g) having the following physical data.
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