[5] A much better approach decomposes a diaryl cyclic trisulfide oxide, C10H6S3O, produced from thionyl chloride and the dithiol.

[6] SO inserts into alkenes, alkynes and dienes producing thiiranes, molecules with three-membered rings containing sulfur.

[2] It has been detected in single-bubble sonoluminescence of concentrated sulfuric acid containing some dissolved noble gas.

The formation of transient SO in the coronary artery of pigs has been inferred from the reaction products, carbonyl sulfide and sulfur dioxide.

[23] Because of sulfur monoxide's rare occurrence in our atmosphere and poor stability, it is difficult to fully determine its hazards.

Sulfur dioxide SO2 in presence of hexamethylbenzene C6(CH3)6 can be protonated under superacidic conditions (HF·AsF5) to give the non-rigid π-complex C6(CH3)6SO2+.