Carboranes alkyl halides

Usually, alkyl halides are convenient starting materials for organic synthesis. The readily available bromomethyl-o-carborane is unfortunately a "dead" synthon for nucleophilic... 

Ortfto-carborane clusters can be functionalized at both the boron and carbon atoms of the cages. Selective functionalization of ortfto-carborane clusters can be achieved at the B(9) boron atom via electrophilic alkylation with alkyl halides and benzyl halides that contain electron-withdrawing... 

C2BioHi2 derivatives with, e.g., R = ester, amine, amide, acyl halide, halogen, ether, alkyl, aryl, alkenyl or alkynyF , although a dialkyne will lead to some bis-carborane ... 

Interestingly, depending on the catalyst, the diboration of vinylboranes with B2cat2 leads via sequential diboration and dehydroboration steps either to 1,1,1-triborylalkanes (20) or to 1,1,2-triborylalkanes (21). 1,1,1-Triborylalkanes, 1,1,2,2,and 1,1,1,2-tetraborylethane species have been proposed as intermediates in the reaction of borylated alkynes with excess Et2BH ( hydride bath ) that eventually leads to the formation of small carboranes. Indeed, isolated triborylmethane species with alkyl or halide substituents on boron have recently been shown to rearrange to small carboranes upon thermal treatment. ... 

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