Abstract
The synthesis and characterization of novel bulky mesitylboratabenzene ligands have been achieved. The isolated boracyclohexadienes 6a,b were found to be extremely stable and could be selectively desilylated by hydrolysis. These ligands have been successfully coordinated to Fe(II) and Cr(II). The selective desilylation of the boratabenzene ring was also observed in the iron complexes, thus furnishing three ironboratabenzene sandwich complexes without a SiMe3 group (11) and with one (10) and two (12) SiMe3 groups. Interestingly, species 11 represents the first structurally characterized bis(boratabenzene) metallic species not exhibiting the expected trans geometry.
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