Influence of the diol structure on the Lewis acidity of phenylboronates
作者:Agnieszka Adamczyk-Woźniak、Michał Jakubczyk、Piotr Jankowski、Andrzej Sporzyński、Piotr M. Urbański
DOI:10.1002/poc.3102
日期:2013.5
cyclic esters of pentafluorophenylboronic acid have been obtained and their Lewisacidity evaluated experimentally by a modified Gutmann method. The results based on 31P NMR measurements were compared with those determined by quantum mechanical calculations at the DFT‐VSXC/pcS‐2 level of theory. The differences in Lewisacidity are discussed on the basis of electronic and geometric parameters. The calculations
An efficient synthesis of biaryls through a gold‐catalyzed oxidative cross‐coupling of arenes with strong electron‐deprived aryl boronates is presented herein. Regio‐ and chemocontrol are achieved by the selective activation of these coupling partners by gold at different oxidation states. Under reaction conditions devoid of basic additives or directinggroups, the role of acetato ligand as an internal
The occurrence of direct transmetalation between gold(III) and boron species during gold-catalyzed cross-coupling reactions has recently become the subject of intense discussion. In this work, we investigate the transmetalation reaction between discrete, stable gold(III) complexes and boron reagents. Interestingly, electron-rich arylboronic acids remain unreactive under neutral conditions, whereas