The reactions of 4-chloro-1,1,1-trifluorobut-3-yn-2-one and 4-bromo-1,1,1-trifluorobut-3-yn-2-one with conjugated dienes afford [4+2] cycloadducts in high yields. The halogen atom in the products is readily replaced by a (het)aryl residue in the cross-coupling with organozinc compounds.
                                    4-chloro-1,1,1-trifluorobut-3-yn-2-one 和 4-bromo-1,1,1-trifluorobut-3-yn-2-one 与共轭二烯反应得到 [4+2 ] 高产率的环加合物。在与
有机锌化合物的交叉偶联中,产物中的卤素原子很容易被(杂)芳基残基取代。