在一般教科书中,认为分子的共轭体系(1-2-3-4)其特点在于它能与进攻试剂×y反应(也能与离子或游离基×和y反应),当质点×加到第1个碳原子上时,不仅引起1-2键的断裂,而且也能引起3-4键的断裂,同时在2-3原子之间形成新的π-键.此时y质点经常是(不是绝对的)加到第4个碳原子上.我们称这一类共 In the general textbook, the conjugate system (1-2-3-4) of a molecule is thought to be characterized by its ability to react with an attacking agent x y (and also react with ions or radicals x and y). When the particle x is added At the first carbon atom, it not only causes the cleavage of the 1-2 bonds, but also causes the cleavage of the 3-4 bonds while forming a new π-bond between the 2-3 atoms. At this time, the y particle is often ( Not absolute) added to the fourth carbon atom, we call this type of total