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HONGKUN / PRODUCT DIRECTORY

1,3,4-Thiadiazole-2-thiol | CAS 18686-82-3

This unmethylated thiadiazole thiol provides a sulfur-bearing heterocyclic precursor for documented derivative chemistry, including a patented accelerator development study; tautomer naming, related heterocycles and analytical basis deserve particular attention during purchasing.

CAS18686-82-3
Molecular formulaC2H2N2S2

Product overview

The sulfur function on an unmethylated 1,3,4-thiadiazole ring defines this compact building block. CAS 18686-82-3 covers the thiol/thione tautomeric system, also named 3H-1,3,4-thiadiazole-2-thione. Its ring substitution distinguishes it from 5-methyl and dimercapto analogues. In published accelerator-development research, it provides the heterocyclic starting fragment for a sulfur-containing derivative. Procurement should identify the full ring structure and align related-substance controls with the intended derivatization. Chromatographic composition and titrimetric assay should be reported separately, with methods and calculation bases agreed before comparing samples.

Chemical identity

Chemical name
1,3,4-Thiadiazole-2-thiol
CAS number
18686-82-3
Molecular formula
C2H2N2S2

Application context

1,3,4-Thiadiazole-2-thiol serves as the heterocyclic precursor to N-cyclohexyl-S-(1,3,4-thiadiazol-2-yl)thiohydroxylamine in published vulcanization-accelerator research. The purchased thiol supplies the unmethylated thiadiazole unit for this derivative. Route qualification should address the ring substitution pattern and relevant sulfur-containing related substances. HPLC composition and titrimetric assay provide different information, so specify the method and reporting basis required for the intended derivatization.

Chemistry and synthetic role

The thiol and thione descriptions concern tautomerism, not two different salt forms. The ring is 1,3,4-thiadiazole and lacks a 5-methyl substituent. These details should accompany the CAS whenever shorthand names are used.

Quality review

Resolve tautomer names

Accept an appropriate structural identification of the thiol/thione system; avoid treating equivalent tautomer names as unrelated products.

Exclude substituted analogues

Review methods for distinguishing methylated or dimercapto thiadiazoles where relevant to the supplier route.

Compare assay methods correctly

Agree separate reporting bases for HPLC composition and titrimetric assay, with sulfur-related impurity controls suited to the intended conversion.

Preparing a specification

State CAS 18686-82-3 and the unmethylated 1,3,4-thiadiazole structure. Define HPLC purity, any titrimetric assay requirement and the related compounds important to the intended derivatization; numerical limits require agreement.

Packaging and storage

Confirm packaging format, net weight and transport arrangements for the selected grade, quantity and destination. Agree storage and handling conditions using the actual supplied material’s SDS and label.

Documentation

Request the proposed specification, COA and SDS. Confirm availability of structural identity evidence, chromatograms and any titration method used; discuss targeted sulfur-related impurity data if the route requires them.

Procurement questions

Why are both thiol and thione names used?

They describe tautomeric forms of the same 1,3,4-thiadiazole system. Use CAS 18686-82-3 and the complete ring structure to match documents.

Is this the 5-methyl derivative?

No. CAS 18686-82-3 identifies the unmethylated ring.

What is its role in accelerator development?

It is a starting heterocycle for the sulfur-containing derivative studied in the cited patent.

Technical sources
  1. PubChem CID 3034302: 1,3,4-Thiadiazole-2-thiolNCBI / PubChem
  2. 1,3,4-Thiadiazole-2-thiol T2884Tokyo Chemical Industry
  3. US9096557B2: Thiadiazole which can be used as a vulcanization accelerator and method for obtaining sameUSPTO patent publication via Google Patents
  4. 1,3,4-Thiadiazole-2-thiol BL3H160C4A5EBLD Pharmatech via Sigma-Aldrich partner catalogue