Barely bidentate: The adduct of dimethylamino naphthalene (proton sponge) and 9‐BBN‐NTf2 is activated by steric hinderance for intermolecular borylation (see scheme). A contrasting addition/elimination pathway is favored when using monodentate triethylamine which gives the first observable borenium salt (9‐BBN‐NEt3+ Tf2N−) lacking any n‐ or π‐donor substitutents.
勉强二齿:
二甲氨基萘(质子海绵)和 9-BBN-NTf 2的加合物被分子间
硼化的空间位阻激活(见方案)。当使用单齿
三乙胺时,相反的添加/消除途径是有利的,它给出了第一个可观察到的
硼盐(9-BBN-NEt 3 + Tf 2 N -),没有任何 n 或 π 供体取代基。