my-server
← Wiki Redirected from Boryl complex

Transition metal boryl complex

In chemistry, a transition metal boryl complex is a molecular species with a formally anionic boron center coordinated to a transition metal. They have the formula L<sub>n</sub>M-BR<sub>2</sub> or L<sub>n</sub>M-(BR<sub>2</sub>LB) (L = ligand, R = H, organic substituent, LB = Lewis base). One example is (C<sub>5</sub>Me<sub>5</sub>)Mn(CO)<sub>2</sub>(BH<sub>2</sub>PMe<sub>3</sub>) (Me = methyl). Such compounds, especially those derived from catecholborane and the related pinacolborane, are intermediates in transition metal-catalyzed borylation reactions.

Synthesis

Oxidative addition is the main route to metal boryl complexes. Both B-H and B-B bonds add to low-valent metal complexes. For example, catecholborane oxidatively adds to Pt(0) to give the boryl hydride.

C<sub>6</sub>H<sub>4</sub>O<sub>2</sub>BH + Pt(PR<sub>3</sub>)<sub>2</sub> → C<sub>6</sub>H<sub>4</sub>O<sub>2</sub>B Pt(PR<sub>3</sub>)<sub>2</sub>H

Addition of diboron tetrafluoride to Vaska's complex gives the triboryl iridium(III) derivative:

2B<sub>2</sub>F<sub>4</sub> + IrCl(CO)(PPh<sub>3</sub>)<sub>2</sub> → Ir(BF<sub>2</sub>)<sub>3</sub>(CO)(PPh<sub>3</sub>)<sub>2</sub> + ClBF<sub>2</sub>

References