Interactions of Isonitriles with Metal-Boron Bonds: Insertions, Coupling, Ring Formation, and Liberation of Monovalent Boron
作者:Holger Braunschweig、Mehmet Ali Celik、Rian D. Dewhurst、Katharina Ferkinghoff、Alexander Hermann、J. Oscar C. Jimenez-Halla、Thomas Kramer、Krzysztof Radacki、Rong Shang、Eva Siedler、Felix Weißenberger、Christine Werner
DOI:10.1002/chem.201600793
日期:2016.8.8
treated with isonitriles including single, double, and partial isonitrile insertions into metal−boron bonds, ringformation, isonitrile coupling, and the liberation of new monovalent boron species. Two of the resulting cyclic species have also been found to react selectively with anhydrous HCl to form ring‐opened products. The diverse isonitrile‐promoted reactivity of transition‐metal–boron compounds has
Activation of boryl-, borylene and metalloborylene complexes by isonitriles
作者:Holger Braunschweig、William C. Ewing、Katharina Ferkinghoff、Alexander Hermann、Thomas Kramer、Rong Shang、Eva Siedler、Christine Werner
DOI:10.1039/c5cc04712a
日期:——
One or several isonitriles can insert into metalloboryl and metalloborylene complexes to afford cyclic or spiro compounds with bonding controlled by the electron count at the metal and in the ring.
作者:Holger Braunschweig、Krzysztof Radacki、Fabian Seeler、George R. Whittell
DOI:10.1021/om060377z
日期:2006.9.1
Transition metal dihaloboryl complexes of the types [(eta(5)-C5R5)Fe(CO)(2)BX2] (R = H, Me; X = F, Cl, Br), [(eta(5)-C5H4Me)Ru(CO)(2)BX2] (X = Cl), and [(OC)(5)MnBX2] (X = Cl, Br) were prepared via salt elimination reactions. Comparison of the CO stretching frequencies indicates a higher degree of Fe- B d(pi)-p(pi) back-bonding in the dibromoboryl complexes [(eta(5)-C5R5)Fe(CO)(2)BBr2] with respect to their -BCl2 and -BF2 analogues. This finding is constistent with the p(pi)-p(pi) back-bonding abilities of the halides (F > Cl > Br). Reactions of [(eta(5)-C5Me5)Fe(CO)(2)BX2] (X = Cl, Br) with 4-methylpyridine were performed, leading to the formation of the corresponding Lewis-base adducts and, with base in excess, to the first metal-substituted boronium cation [(eta(5)-C5Me5)Fe(CO)(2)BBr(NC5H4-4-Me)(2)](+).
Boron as a Bridging Ligand
作者:Holger Braunschweig、Krzysztof Radacki、David Scheschkewitz、George R. Whittell