A novel enantioselective synthetic approach to 1,4-benzodioxane lignans was reported in which (2R, 3R)- and (2S, 3S)-2-(4-hydroxyphenyl)-3-hydroxymethyl-1, 4-be
A unique Sliver(1)-promoted oxidation reaetion of polyphenyl-cyclopentadienc is deseribed,in which an oxygen is inserted into the cyclopentadienc-ring.forming a