In chemistry, a sultine is a cyclic ester of a sulfinic acid. This class of organosulfur compounds has few applications. These compounds are typically prepared by the dehydration of hydroxy-sulfinic acids or their equivalent. Illustrative of an alternative route, xylylene dibromide reacts with sodium sulfoxylate (source of SO<sub>2</sub><sup>2-</sup>) to give the sultine C<sub>6</sub>H<sub>4</sub>(CH<sub>2</sub>S(O)OCH<sub>2</sub>), which is a precursor to o-quinodimethane.