Hexamethylborazine (${\mathrm{B}}_3{\mathrm{N}}_3\mathrm{M}{\mathrm{e}}_6$)

Hexamethylborazine is ${\mathrm{B}}_3{\mathrm{N}}_3\mathrm{M}{\mathrm{e}}_6$, with one methyl on every ring atom. Its nitrogen atoms can form Lewis acid-base adducts, while nucleophiles can attack its boron atoms.