Aromatic nitroso compounds and diphenyl ketene yield 1:1-adducts or compounds derived therefrom. The direction of this addition is dependent upon the substituent of the nitroso compound: strongly electron-donating groups (p-methoxy or p-dimethylamino-) favour the direction of addition, which would be expected for a polar reaction. In all other cases, the addition proceeds in the reverse sense.
                                    芳族亚
硝基化合物和二苯基
乙烯酮可产生1:1的加合物或由其衍生的化合物。该加料的方向取决于亚
硝基化合物的取代基:强供电子基团(对甲氧基或对
二甲氨基)有利于加成方向,这是极性反应所期望的。在所有其他情况下,加法以相反的方式进行。