In a manner similar to Example 12A, the reaction of 0.51 g (0.0016 mole) of (±)-cis-3-(2,2-dibromoethenyl)-2,2-dimethylcyclopropanecarbonyl chloride (an additional four drops were added 1 hour after original addition) with 0.33 g (0.0016 mole) of (+)-4-phenyl-2-indanol (EE 50%), 0.16 g (0.002 mole) of pyridine and toluene produced an oil. The oil was subjected to vacuum column chromatography, whereby the oil was placed on silica gel packed in a sintered glass suction funnel, and the eluant was drawn through by water aspirator vacuum. Elution was accomplished with hexane, then 24:1 hexane/ethyl acetate to give (+)-4-phenyl-2-indanyl (±)-cis-3-(2,2-dibromoethenyl)-2,2-dimethylcyclopropanecarboxylate as an oil, EE 50% (alcohol moiety). The nmr spectrum was consistent with the proposed structure.
