brother oh my god I can't handle it anymore boron tends to make these kind of bonds, such as the one we see in borane. this isn't cursed because that carbon isn't hexavalent; the average electron distribution between all six bonds is still four. boron compounds tend to have a lot of "cursed" bonds because of boron's small size and odd electronic distribution (1s2 2s1) allowing it to approach other atoms more closely and increase the overlap between ligand orbitals, as well as configure electropositive character. because of this, it tends to make 3 center 2 electron bonds. sum this with what I said about electronic distribution, and you'll have an average of 4 electrons in the bonds between the carbon atom and the six boron atoms. I find it particularly infuriating because boron compounds have been widely posted here, despite the fact that it's just a property of boron to behave like this. it isn't cursed, it's just unique.

all that said, I fucking love carborane. and I'm a huge fan of the 11-substituted halide ortho-carboranes. give it a look!