The uncatalyzed cycloadditions of 2,6-dialkoxyanthracenes (2) to cholesteric liquid-crystalline fumarates (1) serving both as dienophiles and media resulted in highly regioselective formation of the syn-adducts (3)(70% d.e.).
2,6-二烷氧基
蒽(2)与胆甾型液晶
富马酸酯(1)的未催化环加成导致双亲和物和介质的高度区域选择性形成了顺式加合物(3)(70%de)。