Disulfide
salt or other derivative of disulfane or organic compound having the structure RSSR (R ≠ H)
In chemistry, a disulfide (or disulphide in British English) is a compound containing a R−S−S−R′ functional group or the S2−2 anion. In inorganic chemistry, the anion appears in the common mineral pyrite but is otherwise rare. Compounds of the form R−S−S−H are usually called persulfides instead.
Disulfide bridges also appear as a common post-translational modification in proteins.
Organic disulfides
Structure
Disulfides have a C–S–S–C dihedral angle approaching 90°. The S–S bond length is 2.03 Å in diphenyl disulfide, similar to that in elemental sulfur.
Disulfides are usually symmetric but they can also be unsymmetric. Symmetrical disulfides are compounds of the formula RSSR. Most disulfides encountered in organosulfur chemistry are symmetrical disulfides. Unsymmetrical disulfides (also called heterodisulfides or mixed disulfides) are compounds of the formula RSSR'. Unsymmetrical disulfide are less common in organic chemistry, but many disulfides in nature are unsymmetrical.
“Disulfide” enters the record as salt or other derivative of disulfane or organic compound having the structure RSSR (R ≠ H). Crown Archives preserves that source wording while asking what Disulfide, salt and other can confirm, complicate or overturn.
Why this record matters
“Disulfide” is worth following because a concise public description often conceals a longer documentary argument. Here, Disulfide, salt and other provides the most credible route into that argument.
The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Sep 12, 2026. The linked authority identifier is Q1230226. None of the 0 selected statements returned an explicit reference.
Overview language is designed for orientation and should not be treated as a substitute for the evidence cited beneath it. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.
- Subject orientation
- Search vocabulary
- Locating named sources
The closest primary source, responsible institution and strongest cited specialist reference.
Three-step research path
- Establish the record: confirm the title “Disulfide”, its source revision and the description used here.
- Expand the search: follow Disulfide primary sources, Disulfide archive and Disulfide research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Disulfide”?
- Which cited source is closest to the event, object or claim?
- Which institution is responsible for the underlying evidence?
Search terms from this dossier
This entry incorporates text from “Disulfide” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.