# Why is nitrobenzene commonly used as a solvent in Friedel-Crafts acylation/alkylation?

Nitrobenzene contains an electron-withdrawing nitro group directly bound to the phenyl ring. As ${-}^{+} N \left(= O\right) {O}^{-}$, i.e. a quaternized nitrogen, it serves to deactivate the aromatic ring towards electrophilic aromatic substitution. And of course, a lack of reactivity is required of a solvent in an organic reaction. It is also relatively high boiling, ($> 210$ ""^@C), so this means you can heat the reaction up high to get it going.