Metalloboranes synthesis

Numerous routes have been devised for the synthesis of metalloboranes. Among the most useful of these are ... 

Some interesting photochemical reactions involving metalloboranes and metallo-carboranes have been reported. These include synthesis, isomerization and complexa-tion reactions. Gaines and Hildebrandt have used the following process to synthesize a metalloborane ... 

They have also demonstrated a reversible photochemical conversion from a tridentate to a bidentate B3H8 (Fig. 14). Fehlner has achieved a photochemical carborane synthesis by irradiating mixtures of B4H8Fe(CO)3 and dimethylacetylene. Products of the reactions include (CH3)4C4B4H4 and (CH3)8C8B4H4. Leyden and co-workers have observed two examples of metalloborane isomerization reactions initiated by light ... 

Franz and coworkers reported the photochemical synthesis of a metalloborane from a carborane and Fe(CO)s (reaction 54). 

The chemistry of metalloborane compounds is vast, although most are not prepared by oxidative addition of the B—H bond to a metal complex neither do they contain metal-hydrogen bonds. The synthesis of metalloborane hydrides involves many routes, the mechanisms of which are obscure. Reactions between borohydrides and transition-metal complexes involve hydride transfer without the formation of a metal-boron bond (see 1.10.7). 

Borane Anions and Metallo-derivatives.—Greenwood and Ward have reviewed the synthesis and structures of metalloboranes, with a discussion of metal-boron bonding.29... 

The new /iiifo-metallocarbaborane species BC4H5Fe(CO)8 (2a or b) has been isolated in low yield from the products of short term pyrolysis of C4H4Fe(CO)s with BsHg. Both structures (2a and 2b) are consistent with the spectral data available, but (2a) is preferred. The synthesis of the metalloborane 2-( -CsH5)CoB4H8, a structural analogue of B5H9, and its reactions have been... 

N. N. Greenwood, Pure and Appl. Chem., 1977,49,791. The synthesis, structure, and chemical reactions of metalloboranes. 

---