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HuagongsheHuagongshe Chemistry Print Report · For research reference only
HCID 17570Generated: October 26, 2026

4,4'-Thiodiphenol

TDP · pharMaceutical interMediate · DFS · 4,4'-Thiodiphenol · 4,4'-Thiodbisphenol · 4,4’-dioxydiphenylsulfide · BIS(4-HYDROXYPHENYL) SULFIDE · Thiodiphenol

https://huagongshe.com/en/chemical/17570

4,4'-Thiodiphenol molecular structure

Identifiers & Physical Properties

CAS No.2664-63-3
Molecular formulaC12H10O2S
Average molar mass218.27 g/mol
Monoisotopic mass218.04015056 g/mol
SMILESOc1ccc(Sc2ccc(O)cc2)cc1
InChIKeyVWGKEVWFBOUAND-UHFFFAOYSA-N
PubChem CID17570
ChEMBLCHEMBL3183502
ChEBICHEBI:38957
EC No.220-197-9
DTXSIDDTXSID9047960

Chemical & Physical Properties

XLogP3.3
Topological polar surface area65.8
Hydrogen bond donors2
Hydrogen bond acceptors3
Rotatable bonds2
Heavy atoms15
Formal charge0
Complexity162
Chemical classesOther Classes -> Sulfur Compounds
LogP (partition coefficient)3.34
Endocrine DisruptorsPotential endocrine disrupting compound
Vapor pressure0.00000018 [mmHg]
Physical DescriptionOff-white crystalline solid[Sigma-Aldrich MSDS]
Melting point154-156 °C (lit.)
Boiling point328.96°C (rough estimate)
Density1.2618 (rough estimate)
Refractive index1.5200 (estimate)
Storage conditionsStore below +30°C.
SolubilityInsoluble in water
Physical stateCrystalline Powder
pKa (acidity coefficient)9.31±0.26(Predicted)
ColorWhite to pale brown
SensitivityAir Sensitive
BRN2050739
InChI1S/C12H10O2S/c13-9-1-5-11(6-2-9)15-12-7-3-10(14)4-8-12/h1-8,13-14H
InChIKeyVWGKEVWFBOUAND-UHFFFAOYSA-N
SMILESOc1ccc(Sc2ccc(O)cc2)cc1
CAS DataBase Reference2664-63-3(CAS DataBase Reference)
EWG's Food Scores1
NCI Dictionary of Cancer TermsDFS
FDA UNIINGN288M6MM
NIST Chemistry Reference4-4' Thio diphenol(2664-63-3)
EPA Substance Registry SystemPhenol, 4,4'-thiobis- (2664-63-3)
UNSPSC Code12352104
NACRESNA.23
GHS pictogramGHS07
Signal wordWarning
GHS hazard statementsH319
GHS precautionary statementsP264-P280-P305+P351+P338-P337+P313
Personal protective equipment (PPE)Eyeshields, Faceshields, Gloves, type P3 (EN 143) respirator cartridges
Hazard symbolsC
Risk statements (R)34
Safety statements (S)26-27-36/37/39-45
UN transport numberUN 3261 8/PG 2
Water hazard class (WGK)2
RTECS numberSN0800000
TSCA inventory statusTSCA listed
Hazard class8Eye Irrit. 2
Packing groupII
Customs code29309070
Storage class11 - Combustible Solids
ToxicityLD50 orally in Rabbit: 3362 mg/kg LD50 dermal Rabbit > 10250 mg/kg
Limited quantities1 Kg (2.2 lbs) (solid)
Excepted quantitiesMax Inner Pack (30g or 30ml) and Max Outer Pack (500g or 500ml)

Safety & Regulations

GHS classificationDangerH314 (81.8%): Causes severe skin burns and eye damage [Danger Skin corrosion/irritation]P260, P264, P264+P265, P280, P301+P330+P331, P302+P361+P354, P304+P340, P305+P351+P338, P305+P354+P338, P316, P321, P337+P317, P363, P405, and P501 (click each P-code to see the statement)Aggregated GHS information provided per 55 reports by companies from 5 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.
Regulatory informationBis(4-hydroxyphenyl)sulfide: Does not have an individual approval but may be used under an appropriate group standard
Hazards summaryCauses tearing and conjunctival irritation in acute ocular studies of rabbitsCauses changes in brain circulation (hemorrhage, thrombosis, etc.) in oral lethal-dose studies of mice[RTECS] Causes burnsInhalation may cause corrosive injuries to upper respiratory tract and lungs[Sigma-Aldrich MSDS] See Phenyl sulfide.
Hazard Classes and CategoriesSkin Corr. 1B (81.8%)
Adverse effectsDermatotoxin - Skin burns.
Personal protective equipment (PPE)Eyeshields, Faceshields, Gloves, type P3 (EN 143) respirator cartridges
Water hazard class (WGK)2
TSCA inventory statusTSCA listed
RTECS numberSN0800000
UN transport numberUN 3261 8/PG 2
Customs code29309070
ToxicityLD50 orally in Rabbit: 3362 mg/kg LD50 dermal Rabbit > 10250 mg/kg
Risk statements (R)34
Signal wordWarning
GHS pictogramGHS07
Hazard symbolsC
Safety statements (S)26-27-36/37/39-45
Hazard class8Eye Irrit. 2
Storage class11 - Combustible Solids
Packing groupII
GHS hazard statementsH319
Limited quantities1 Kg (2.2 lbs) (solid)
Excepted quantitiesMax Inner Pack (30g or 30ml) and Max Outer Pack (500g or 500ml)
GHS precautionary statementsP264-P280-P305+P351+P338-P337+P313

Applications & Uses

Uses

Intermediate, flame-retardant, antioxidant, engineering plastics.

Uses

4,4'-thiobis-phenol can be applied to produce a non-halogen type epoxy (meth)acrylate resin having high refractive index, transparency and thermal stability. It is also used to produce a non-systemic organophosphorus insecticide TEMEPHOS.