The reactions of carbodiimides with ironborylene and bis(borylene) complexes yield a variety of products, including known FeBNC and novel FeBNB metallacycles, complexes of N-heterocyclic boracarbene ligands, and a unique 1,3,2,4-diazadiborolyl pianostool complex. The product distributions can be rationalized by considering sequences of cycloaddition, metathesis, insertion, and C−H activation pathways
2,2′-Bipyridyl is shown to spontaneously abstract a borylene fragment (R–B:) from various hypovalent boron compounds. This process is a redox reaction in which the bipyridine is reduced and becomes a dianionic substituent bound to boron through its two nitrogen atoms. Various transition metal–borylene complexes and diboranes, as a well as a diborene, take part in this reaction. In the latter case,
Complete and Partial 1,2-Additions across Transition Metal–Boron Double Bonds
作者:Holger Braunschweig、Qing Ye、Alfredo Vargas、Rian D. Dewhurst、Florian Hupp
DOI:10.1021/ja504761f
日期:2014.7.9
The first 1,2-additions across a metal-boron double bond are reported, one a definitive chlorogallation of a Fe=B bond, the other a partial chlorogallation of a Mo=B bond that leads to a highly unusual, planar Mo-B-Ga-Cl rhombus. The two reactions occur with opposite regiochemistry, with the Ga atom bound to the Fe atom in the former and to both the Mo and B atoms in the latter. The bonding in the Mo adduct and the reasons for the differing regiochemistry of the reaction are explored computationally.