Based on Homonuclear Trimetal Units

Assembly of a tetrahedral Fe3B core is achieved in the reaction of Na[Fe(CO)4C(0)Me] with BH3THF followed by protonation red-orange HFe3(CO)9BH4 (6) is formed in 5% yield and has been crystallographically 

The electronic structure of 6 has been probed by using the Fenske-Hall quantum chemical method, and the factors that influence the distribution of endo-hydrogen atoms have been examined (30). The preference for M—H—B versus M—H—M interactions may also be rationalized in 

Reduction of the boron-bound CO group in 8 is achieved by using 

B—C Bond Distances in Transition Metal Clusters Containing Boron Atoms  

Clusters based on homonuclear trimetal units are dominated by those containing transition metals from the iron triad. Clusters constructed on a Co3 framework are the only additional examples in this section. The first cluster to be reported was Co3(CO)9BNEt3 (22). This arises from the reaction of [Co(CO)4] with BBr3 in the presence of NEt3 and is clearly related to the triosmium systems of Shore et al. discussed above (Fig. 7) 

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