Boryliridium and boraethyliridium complexes fac-[IrH2(PMe3)3(BRR')] and fac-[IrH(PMe3)3(.eta.2-CH2BHRR')]

Boryl- and Bridging Boryleneiron Complexes from Aminodichloroboranes

“…

Depending on the nature of the amino group bound to the boron atom, the reactions of various aminodichloroboranes R 2 NBCl 2 with Na[(η Since 1990, when the first transition-metal complex with a two-center, two-electron bond between the metal and a threefold coordinated boron atom was structurally characterized [1] , such boryl complexes have become of increasing interest, as they are known to be important intermediates in transition-metal-catalyzed hydroboration [2] [3] [4] , and, very recently, the selective functionalization of alkanes in terminal position was achieved by photolysis of a boryltungsten complex [5] . During the last seven years a large number of structurally authentic boryl complexes have been described and the 1,2-dioxobenzo or "catechol" group, as ligand to boron, has had a pivotal role in obtaining these compounds, since most of them were either obtained by the reaction of an anionic transition-metal complex with CatBCl (Cat ϭ 1,2-O 2 C 6 H 4 )

[ In contrast to the well-developed chemistry of boryl transition metal complexes, knowledge about the corresponding borylene complexes is restricted to only one example (and derivatives of this).

…”

The Chemistry of Borylene Complexes

“…Despite very early investigations in this area (vide infra), [1] the first structurally authenticated transition metal complexes of boron date back only to 1990. [2,3] Until then, confirmed knowledge of compounds with direct transition metalϪboron bonds was restricted to borides, [4Ϫ6] metallaboranes metal−boron bond and about the nature of metal and borylene moieties required for the formation of stable complexes.…”

“…According to the coordination number of boron and the number of metalϪboron bonds, one can distinguish between borane (I), boryl (II), bridged (III) and terminal borylene (IV) complexes. Borane complexes can be understood as Lewis acidϪbase adducts of basic metal centres and acidic boranes BR 3 , giving rise to fourfold coordination of the boron atom. Boryl complexes, however, show boron in coordination number three, achieved by the linking of a BR 2 group to a metal centre.…”

Synthesis and Structural Characterization of Novel Thulium(III) Cyclic Organohydroborate Complex with a Weak Agostic Interaction (THF)3Tm{(μ-H)2(BC8H14) }3

“…5 In an effort to extend lanthanide organohydroborate chemistry, the complexes have been investigated.…”