Cage-Walking: Vertex Differentiation by Palladium-Catalyzed Isomerization of B(9)-Bromo-<i>meta</i>-Carborane
作者:Rafal M. Dziedzic、Joshua L. Martin、Jonathan C. Axtell、Liban M. A. Saleh、Ta-Chung Ong、Yun-Fang Yang、Marco S. Messina、Arnold L. Rheingold、K. N. Houk、Alexander M. Spokoyny
DOI:10.1021/jacs.7b04080
日期:2017.6.14
We report the first observed Pd-catalyzed isomerization (“cage-walking”) of B(9)-bromo-meta-carborane during Pd-catalyzedcross-coupling, which enables the formation of B–O and B–N bonds at all boron vertices (B(2), B(4), B(5), and B(9)) of meta-carborane. Experimental and theoretical studies suggest this isomerization mechanism is strongly influenced by the steric crowding at the Pd catalyst by either