trans-1,2-ジベンゾイルエチレンの還元で得られる二量体の構造

抄録

The stereochemistry of five dimers derived from trans-1, 2-dibenzoylethylene [1], which has already been reported by Lutz et al., was reexamined on the basis of IR and NMR spectra since it seemed to be somewhat obscure.
On the other hand, the reduction of [ 1 ] with aluminum isopropoxide produced the substance [ 7 ] (mp 188-489° C), which had not been examined in detail, besides normal products, trans1, 4-dipheny1-2-butene-1, 4-diols. In this paper, determination of the structures of [7] and the substance [8] (mp 213-214T), which the author recently obtained by the reduction, was made on the basis of IR and NMR spectra, proving them to be dimers different from those above; and also the mechanism of formation of [7] was discussed.