Iron can catalyze head-to-head dimerization of terminal aryl alkynes to give the corresponding (E) selective conjugated enynes in high yields. A variety of substituted aryl acetylenes underwent smooth dimerization using catalytic FeCl3 and DMEDA in the presence of KOtBu.
                                    铁可以催化末端芳香炔的头对头二聚反应,以高产率生成相应的(E)选择性共轭烯炔。多种取代芳香炔在KOtBu存在下,使用催化剂FeCl3和
DME
DA顺利完成二聚反应。