The α-lithiobenzyloxy group, easily generated from aryl benzyl ethers by selective α-lithiation with t-BuLi at low temperature, behaves as a directed metalation group (DMG) providing a direct access to o-lithiophenyl α-lithiobenzyl ethers. This ortho-directing effect is reinforced in substrates bearing an additional methoxy group at the meta position. The generated dianions can be reacted with a selection
α-
硫代苄氧基很容易通过在低温下用t -BuLi选择性地进行α-
锂化反应而从芳基苄基醚生成,其表现为定向
金属化基团(
DMG),可直接与邻-
硫代苯基α-
硫代苄基醚接触。这种邻位导向作用在在间位带有额外甲氧基的底物中得到增强。生成的二价阴离子可与包括
羧酸酯和二卤
硅烷或
锗烷在内的各种亲电试剂反应,这些亲电试剂可从简单的芳基苄基醚制得令人感兴趣的
苯并呋喃,
硅烷基(
锗)二氢
苯并呋喃和
硅铬烷衍
生物。