Abstract The title compounds were obtained by α-hydroxylation of the corresponding α, β- dibenzyl-γ-butyrolactones (lignans of synthetic origin), and were correlated to (±)- methyltrachelogenin 9 whose relative structure was definitely established by X-ray cristallography.(-)-Trachelogenin 1 and (-)-nortrachelogenin 12 thus have the (8S, 8′ S) absolute configuration, whereas (+)-nortrachelogenin 20 (or wikstromol) has the (8R, 8′ ...
