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
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1085 [Terms] [Paper]