Improved syntheses of 1-fluoropropadiene and 1,1-difluoropropadiene are presented as is the synthesis of a third reactive allene, 1,1-difluoro-3- methyl-1,2-butadiene. Gram quantities of these highly reactive fluorinated allenes may be prepared conveniently in high yield and purity. All three are reactive dienophiles and cycloadd regiospecifically using their non- fluorine-substituted double bonds.
提出了改进的1-
氟丙二烯和1,1-二
氟丙二烯的合成,以及第三反应性
丙二烯1,1-二
氟-3-甲基-1,2-
丁二烯的合成。可以方便地以高收率和纯度制备克数量的这些高反应性
氟化烯丙二酮。所有这三个都是反应性的亲双烯体,并使用其非
氟取代的双键进行区域特异性环加成。