A solvent with a comparatively high @[email protected] (or @[email protected]), greater than ca. 15, and a sizable permanent @[email protected], that cannot donate suitably @[email protected] hydrogen atoms to form strong hydrogen bonds, e.g. dimethyl sulfoxide. The term (and its alternative '@[email protected]') is a misnomer and is therefore discouraged. Such solvents are usually not @[email protected] but @[email protected] (and at most weakly @[email protected]). In describing a solvent it is better to be explicit about its essential properties, e.g. dipolar and non-protogenic.
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1106 [Terms] [Paper]