[Cl:1][CH2:2][CH2:3][CH2:4][CH:5]1[CH2:13][C:12]2[C:7](=[C:8]([Cl:17])[C:9]([Cl:16])=[C:10]([O:14][CH3:15])[CH:11]=2)[C:6]1=[O:18].N12CCCC1=NCCC2.[CH:28]([C:30]([CH3:32])=[O:31])=[CH2:29].O>O1CCCC1>[Cl:1][CH2:2][CH2:3][CH2:4][C:5]1([CH2:29][CH2:28][C:30](=[O:31])[CH3:32])[CH2:13][C:12]2[C:7](=[C:8]([Cl:17])[C:9]([Cl:16])=[C:10]([O:14][CH3:15])[CH:11]=2)[C:6]1=[O:18]2-(3-Chloropropyl)-6,7-dichloro-2,3-dihydro-5-methoxy-1H-inden-1-one (59 g, 0.20 mole) was dissolved in tetrahydrofuran (50 ml) and 1,5-diazabicyclo[4.3.0]non-5-ene (DBN) (3 ml) added. The mixture was stirred and methyl vinyl ketone (28.3 g, 0.404 mole) added dropwise over 30 minutes. The temperature rose from 22° C. to 35° C. over the addition period. The mixture was stirred for an additional hour at ambient temperature, then poured into cold water. The solid that separated was removed by filtration, washed with water, dried and recrystallized from a mixture of tetrahydrofuran and ether to give 2-(3-chloropropyl)-6,7-dichloro-2,3-dihydro-5-methoxy-2-(3-oxobutyl)-1H-inden-1-one, 58.5 g, m.p. 120°-122° C.
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