https://doi.org/10.1351/goldbook.A00425
Non-@P04904@ (in a given situation). (With extremely strong @B00744@ or @B00745@, solvents that are normally aprotic may accept or lose a @P04906@. For example, acetonitrile is in most instances an aprotic solvent, but it is @P04916@ in the presence of concentrated sulfuric acid and @P04904@ in the presence of potassium tert-butoxide. Similar considerations apply to benzene, trichloromethane, etc.)
See also:
dipolar aprotic solvent