dispersion-controlled noncatalytic (2 + 2) cyclodimerization of substituted benzynes to selectively afford proximal biphenylenes in high yields and regioselectivities, depending on the extent of dispersion interactions in the substituents. This method can be applied for the synthesis of novel helical biphenylenes, which would be fascinating for chemists as these compounds are potential skeletons for ligands, catalysts
近年来,作为范德华势的有吸引力的组成部分,伦敦分散相互作用被发现在控制各种反应的区域和/或立体选择性方面发挥着重要作用。特别是,底物和
催化剂(或
配体)之间的分散相互作用在各种选择性
催化剂中占主导地位。相比之下,在大多数非催化反应中,大取代基之间的排斥空间相互作用而不是吸引分散相互作用占主导地位。在此,我们展示了取代
苄基的伦敦分散控制的非催化 (2 + 2) 环二聚化的第一个例子,根据取代基中分散相互作用的程度,以高产率和区域选择性选择性地提供近端
联苯。