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HuagongsheHuagongshe Chemistry Print Report · For research reference only
HCID 34296Generated: October 23, 2026

2,4-Dimethylthiophene

2,4-Dimethylthiophene · Thiophene, 2,4-dimethyl- · 2,4-Dimethylthiophene in isooctane · 2,4-dimethylthiophene CAS NO.638-00-6 · 2,4-DIMETHYLTHIOPHENE ISO 9001:2015 REACH · 2,4-Dimethylthiophene, 95%, for synthesis

https://huagongshe.com/en/chemical/34296

2,4-Dimethylthiophene molecular structure

Identifiers & Physical Properties

CAS No.638-00-6
Molecular formulaC6H8S
Average molar mass112.19 g/mol
Monoisotopic mass112.03467126 g/mol
SMILESCc1csc(C)c1
InChIKeyCPULIKNSOUFMPL-UHFFFAOYSA-N
PubChem CID34296
EC No.211-312-3
DTXSIDDTXSID40213238

Chemical & Physical Properties

XLogP2.4
Topological polar surface area28.2
Hydrogen bond donors0
Hydrogen bond acceptors1
Rotatable bonds0
Heavy atoms7
Formal charge0
Complexity61.2
SpringerMaterials PropertiesBoiling point
Boiling point139.00 to 141.00 °C. @ 760.00 mm Hg139-141°C
Melting point-66.9°C (estimate)
Density0,994 g/cm3
Refractive index1.5078
Storage conditionsKeep in dark place,Inert atmosphere,Store in freezer, under -20°C
Physical stateliquid (estimate)
AppearanceColorless to light yellow Liquid
Henry's law constant1.5×10-3 mol/(m3Pa) at 25℃, Yaws et al. (2003)
InChIInChI=1S/C6H8S/c1-5-3-6(2)7-4-5/h3-4H,1-2H3
InChIKeyCPULIKNSOUFMPL-UHFFFAOYSA-N
SMILESC1(C)SC=C(C)C=1
LogP (partition coefficient)2.595 (est)
CAS DataBase Reference638-00-6(CAS DataBase Reference)
FDA UNIIQ9B2TF3UVC
GHS pictogramGHS07
Signal wordWarning
GHS hazard statementsH302-H315-H319-H332-H335
GHS precautionary statementsP261-P280-P305+P351+P338
Risk statements (R)10-36/37/38
Safety statements (S)16-36/37/39-26
UN transport number1993
Hazard classIRRITANT
Customs code29349990

Safety & Regulations

GHS classificationDangerH225 (33.3%): Highly Flammable liquid and vapor [Danger Flammable liquids]P210, P233, P240, P241, P242, P243, P261, P264, P264+P265, P270, P271, P280, P301+P317, P302+P352, P303+P361+P353, P304+P340, P305+P351+P338, P317, P319, P321, P330, P332+P317, P337+P317, P362+P364, P370+P378, P403+P233, P403+P235, P405, and P501 (click each P-code to see the statement)Aggregated GHS information provided per 3 reports by companies from 3 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.
Hazard Classes and CategoriesFlam. Liq. 2 (33.3%)
UN transport number1993
Customs code29349990
Risk statements (R)10-36/37/38
Signal wordWarning
GHS pictogramGHS07
Safety statements (S)16-36/37/39-26
Hazard classIRRITANT
GHS hazard statementsH302-H315-H319-H332-H335
GHS precautionary statementsP261-P280-P305+P351+P338

Applications & Uses

Uses

2,4-Dimethylthiophene is a biochemical used for proteomics and food research.