The reaction of 1, 2-dibromo-1, 2-bis(4-methoxyphenyl)ethane with alcohols was associated with rearrangement to give the corresponding bis(4-methoxyphenyl)acetals. In boiling ethylene glycol 4,4′-dimethoxy-deoxybenzoin was also obtained due to an aldehyde-ketone rearrangement. 4,4′-Dimethoxybenzophenone was also formed being apparently derived from the acetals. The mechanism of formation of the acetals
1,2-二
溴-1,2-双(4-
甲氧基苯基)
乙烷与醇的反应与重排有关,得到相应的双(4-
甲氧基苯基)
乙缩醛。在沸腾的
乙二醇中,由于醛-酮重排,也获得了4,4'-二甲氧基-脱氧
安息香素。显然也衍生自
缩醛的4,4'-二甲氧基
二苯甲酮也被形成。已经讨论了
缩醛的形成机理。