special structural features, such that attack by dienophiles would be (a) from below—due to repulsive interactions, both electronic and steric, or (b) if the electronic influence from above was less efficient, than the attack would be from both directions. The predicted course of all the reactions has been realised experimentally.
                                    制备了许多具有特殊结构特征的
螺旋藻底物,使得双亲亲虫的攻击是(a)从下面-由于电子和空间的排斥相互作用,或者(b)如果来自上面的电子影响效率不如攻击将来自两个方向。所有反应的预测过程已通过实验实现。