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HuagongsheHuagongshe Chemistry Print Report · For research reference only
HCID 519829Generated: October 31, 2026

Ethyl tellurac

TDEC · ETHYL TELLURAC · TeEDC · Tellurac · TDEC(TEL) · nci-c02857 · Te(DEDTC)4 · noccelerttte

https://huagongshe.com/en/chemical/519829

Ethyl tellurac molecular structure

Identifiers & Physical Properties

CAS No.20941-65-5
Molecular formulaC20H40N4S8Te
Average molar mass720.7 g/mol
Monoisotopic mass722.0080894 g/mol
SMILESCCN(CC)C(=S)S[Te](SC(=S)N(CC)CC)(SC(=S)N(CC)CC)SC(=S)N(CC)CC
InChIKeyDADTZHAWDPZVFJ-UHFFFAOYSA-N
PubChem CID519829
EC No.244-121-9
DTXSIDDTXSID3020594

Chemical & Physical Properties

Topological polar surface area243
Hydrogen bond donors0
Hydrogen bond acceptors8
Rotatable bonds16
Heavy atoms33
Formal charge0
Complexity526
PolymersPlastics & Rubber -> Dithiocarbamates (Rubber)
Density1.44 (NTP, 1992) - Denser than waterwill sink
Solubilityless than 0.1 mg/mL at 73 °F (NTP, 1992)SOL IN BENZENE, CARBON DISULFIDE, CHLOROFORMSLIGHTLY SOL IN ALCOHOL, GASOLINEINSOL IN WATER<0.01 g/100 mL at 23 ºC
Endocrine DisruptorsPotential endocrine disrupting compound
DecompositionWhen heated to decomposition it emits very toxic fumes of /nitrogen oxides, sulfur oxides, and tellurium/.
Melting point226 to 244 °F (NTP, 1992)108-118°C
Physical DescriptionEthyl tellurac is an orange-yellow to bright yellow fluffy powder. (NTP, 1992)Orange-yellow to bright yellow solid[CAMEO] Orange-yellow powder[MSDSonline]
Other Experimental PropertiesOrange-yellow powderdensity: 1.44 +- 0.03mp: 108-118 °C /Technical/
Vapor pressure0Pa at 20℃
Physical statesolid
Specific gravity1.55
Hydrolytic Sensitivity4: no reaction with water under neutral conditions
LogP (partition coefficient)4.39 at 25℃
Toxicology and CarcinogenesisBioassay of Ethyl Tellurac for Possible Carcinogenicity (CASRN 20941-65-5)
FDA UNII0653A77079
NIST Chemistry ReferenceEthyl tellurac(20941-65-5)
IARC3 (Vol. 12, Sup 7) 1987
EPA Substance Registry SystemEthyl tellurac (20941-65-5)
GHS pictogramGHS09
GHS hazard statementsH400-H410-H331
GHS precautionary statementsP273-P391-P501-P261-P271-P304+P340-P311-P321-P403+P233-P405-P501-P273-P391-P501
TSCA inventory statusTSCA listed
Hazardous substances data20941-65-5(Hazardous Substances Data)
REACH registrationsActive

Safety & Regulations

GHS classificationThis chemical does not meet GHS hazard criteria for 62% (49 of 79) of all reports.DangerH331 (25.3%): Toxic if inhaled [Danger Acute toxicity, inhalation]P261, P271, P273, P304+P340, P316, P321, P391, P403+P233, P405, and P501 (click each P-code to see the statement)Aggregated GHS information provided per 79 reports by companies from 5 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.Not Classified
Regulatory informationChemical: Carbamodithioic acid, diethyl-, tetrakis(anhydrosulfide) with thiotelluric acid (H4TeS4)REACH registered substance: Tetrakis(diethyldithiocarbamato-S,S')tellurium (EC: 244-121-9)
Fire hazardsFlash point data for this chemical are not availablehowever, it is probably combustible. (NTP, 1992)
Health hazardsACUTE/CHRONIC HAZARDS: When heated to decomposition this compound emits very toxic fumes. (NTP, 1992)
Hazards summaryA mild eye irritantOverexposure may cause garlic odor of breath and sweat. [MSDSonline] Several of the dialkyldithiocarbamates are known skin sensitizersSee Carba mix.
Reactive groupThiocarbamate Esters and Salts/Dithiocarbamate Esters and Salts
Special ReportsDHEW/NCIBioassay of Ethyl Tellurac for Possible Carcinogenicity (1979) Technical Rpt Series No. 152 DHEW Pub No. (NIH) 79-1708
OSHA StandardsPermissible Exposure Limit: Table Z-1 8-hr Time Weighted Avg: 0.1 mg/cu m. /Tellurium and compounds, as Te/
Reactivity ProfileETHYL TELLURAC is sensitive to prolonged exposure to light. (NTP, 1992)
Air and Water ReactionsInsoluble in water.
NIOSH RecommendationsRecommended Exposure Limit: 10 Hr Time-Weighted avg: 0.1 mg/cu m. /Tellurium compounds (as Te) except tellurium hexafluoride and bismuth telluride/

Applications & Uses

Uses

Tellurium diethyldithiocarbamate (CAS# 20941-65-5) is an organometallic compound used in the synthesis of fusiform-shaped Te-Au hybrids for efficient electrocatalytic oxidation of isopropanol.

General Description

Orange-yellow to bright yellow fluffy powder.

Hazard Classes and CategoriesAcute Tox. 3 (25.3%)
Fire fightingFires involving this material can be controlled with a dry chemical, carbon dioxide or Halon extinguisher. (NTP, 1992)
First aidEYES: First check the victim for contact lenses and remove if present. Flush victim's eyes with water or normal saline solution for 20 to 30 minutes while simultaneously calling a hospital or poison control center. Do not put any ointments, oils, or medication in the victim's eyes without specific instructions from a physician. IMMEDIATELY transport the victim after flushing eyes to a hospital even if no symptoms (such as redness or irritation) develop.
Nonfire spill responseSMALL SPILLS AND LEAKAGE: If a spill of this chemical occurs, FIRST REMOVE ALL SOURCES OF IGNITION, then you should dampen the solid spill material with acetone and transfer the dampened material to a suitable container. Use absorbent paper dampened with acetone to pick up any remaining material. Seal your contaminated clothing and the absorbent paper in a vapor-tight plastic bag for eventual disposal. Solvent wash all contaminated surfaces with acetone followed by washing with a soap and water solution. Do not reenter the contaminated area until the Safety Officer (or other responsible person) has verified that the area has been properly cleaned.
Disposal methodsSRP: At the time of review, criteria for land treatment or burial (sanitary landfill) disposal practices are subject to significant revision. Prior to implementing land disposal of waste residue (including waste sludge), consult with environmental regulatory agencies for guidance on acceptable disposal practices.
Threshold Limit Values (TLV)0.1 [mg/m3], as Te8 Hr Time-Weighted Avg (TWA): 0.1 mg/cu m. /Tellurium & compounds (NOS), as Te, excluding hydrogen telluride/Excursion Limit Recommendation: Excursions in worker exposure levels may exceed 3 times the TLV-TWA for no more than a total of 30 minutes during a work day, and under no circumstances should they exceed 5 times the TLV-TWA, provided that the TLV-TWA is not exceeded. /Tellurium & compounds (NOS), as Te, excluding hydrogen telluride/
Permissible Exposure Limit (PEL)0.1 [mg/m3], as Te
Personal Protective Equipment (PPE)RECOMMENDED RESPIRATOR: Where the neat test chemical is weighed and diluted, wear a NIOSH-approved half face respirator equipped with an organic vapor/acid gas cartridge (specific for organic vapors, HCl, acid gas and SO2) with a dust/mist filter. (NTP, 1992)
Other Standards Regulations and GuidelinesUSSR: 0.01 mg/cu (1967). /Tellurium & cmpd/
Immediately Dangerous to Life or Health (IDLH)25.0 [mg/m3], as Te
Ongoing Test StatusThe following link will take the user to the National Toxicology Program (NTP) Test Agent Search Results page, which tabulates all of the "Standard Toxicology & Carcinogenesis Studies", "Developmental Studies", and "Genetic Toxicity Studies" performed with this chemical. Clicking on the "Testing Status" link will take the user to the status (i.e., in review, in progress, in preparation, on test, completed, etc.) and results of all the studies that the NTP has done on this chemical. [http://ntp-apps.niehs.nih.gov/ntp_tox/index.cfm?fuseaction=ntpsearch.searchresults&searchterm=20941-65-5]
Human Toxicity ExcerptsA number of carbamate esters, dialkyldithiocarbamates, ethylenebisdithiocarbamates and carbazides, which are or were produced and for which a suspicion of carcinogenicity was reported, are considered. Compounds examined include ethyl tellurac ... . Reports on the formation of N-nitroso compounds through the reaction of many of the N-alkylureas or N-alkylcarbamates (and thiocarbamates) under mildly acid conditions were briefly considered. The data were evaluated in terms of human risk ... .
Carcinogen ClassificationEthyl telluracGroup 3: Not classifiable as to its carcinogenicity to humansVolume 12: (1976) Some Carbamates, Thiocarbamates and Carbazides1987
Non-Human Toxicity Excerpts/(C57BL/6XC3H/ANF)F1 & (C57BL/6XAKR)F1 MICE GIVEN SINGLE DOSE SC 1000 MG/KG IN 0.5% GELATINE ON 28TH DAY OF LIFE & OBSERVED APPROX 78 WK. TUMOR INCIDENCE COMPARED WITH UNTREATED OR VEHICLE-INJECTED CONTROLS/. INCIDENCES...NOT INCR... [WORKING GROUP NOTED NEG RESULT...MAY NOT BE ADEQUATE BASIS FOR DISCOUNTING CARCINOGENICITY]/7 DAY OLD (C57BL/6XAKR)F1 MICE WAS ADMIN 46.4 MG/KG IN GELATINE BY STOMACH TUBE & SAME AMT DAILY UP TO 4 WK OF AGETHEN 149 MG/KG OF DIET. EXPT TERMINATED WHEN MICE ABOUT 78 WK OLD/. INCIDENCE OF LUNG TUMORS IN MALES & FEMALES...WAS 7/36, COMPARED WITH 12/172 IN CONTROLS.../7 DAY OLD (C57BL/6XC3H/ANF)F1 & (C57BL/6XAKR)F1 MICE ADMIN 46.4 MG/KG IN GELATINE BY STOMACH TUBE & SAME AMT DAILY UP TO 4 WK OF AGETHEN 149 MG/KG OF DIET. EXPT TERMINATED MICE ABOUT 78 WK OLD/. HEPATOMAS...IN 4/16 MALES OF 1ST STRAIN & IN 3/18 MALES OF SECOND STRAIN, COMPARED WITH 8/79 & 5/90 IN CONTROLS.... It is concluded that under the conditions of this bioassay, ethyl tellurac was not carcinogenic for F344 rats or B6C3Fl mice of either sex. The incidence of mesotheliomas in dosed male rats and the incidence of adenomas of the lacrimal (harderian) gland of the eye in dosed mice of either sex provided evidence which was suggestive but under the conditions of the bioassay insufficient to establish the carcinogenicity of ethyl tellurac in these animals. ... Levels of Evidence of Carcinogenicity: Male Rats: EquivocalFemale Rats: NegativeMale Mice: EquivocalFemale Mice: Equivocal.Seven dithiocarbamates and 3 acetates were tested for teratogenicity and lethality in 3-day chicken embryos. These included cadmium diethyldithiocarbamate (CdDE), zinc diethyldithiocarbamate (ZnDE), zinc ethylphenyldithiocarbamate (ZnEP), zinc dibutyldithiocarbamate (ZnDB), copper dimethyldithiocarbamate (CuDM), tellurium diethyldithiocarbamate (TeDE) And piperidine pentamethylenedithiocarbamate (PPM), cadmium acetate (CdAC), copper-(II) acetate (CuAC) and zinc acetate (ZnAC). The parameters measured were early deaths, recorded within 2 days of injection, late deaths of malformed embryos, late deaths of nonmalformed embryos and malformed survivors. The order of embryotoxicity decreased as follows: CdAC > CdDE > ZnDE \ ZnEP \ ZnDB > CuDM > TeDE > CuAC > PPM > ZnAC. The only exception to this order was the relatively weak teratogenicity of the metal acetates as compared to dithiocarbamates.
Evidence for CarcinogenicityNo data are available in humans. Inadequate evidence of carcinogenicity in animals. OVERALL EVALUATION: Group 3: The agent is not classifiable as to its carcinogenicity to humans.
Antidote and Emergency TreatmentBasic treatment: Establish a patent airway. Suction if necessary. Watch for signs of respiratory insufficiency and assist ventilations if needed. Administer oxygen by nonrebreather mask at 10 to 15 L/min. Monitor for pulmonary edema and treat if necessary ... . Monitor for shock and treat if necessary ... . Anticipate seizures and treat if necessary ... . For eye contamination, flush eyes immediately with water. Irrigate each eye continuously with normal saline during transport ... . Do not use emetics. For ingestion, rinse mouth and administer 5 ml/kg up to 200 ml of water for dilution if the patient can swallow, has a strong gag reflex, and does not drool ... . Cover skin burns with dry sterile dressings after decontamination ... . /Poison A and B/Advanced treatment: Consider orotracheal or nasotracheal intubation for airway control in the patient who is unconscious, has severe pulmonary edema, or is in respiratory arrest. Positive pressure ventilation techniques with a bag valve mask device may be beneficial. Monitor cardiac rhythm and treat arrhythmias as necessary ... . Start an IV with D5W /SRP: "To keep open", minimal flow rate/. Use lactated Ringer's if signs of hypovolemia are present. Watch for signs of fluid overload. Consider drug therapy for pulmonary edema ... . For hypotension with signs of hypovolemia, administer fluid cautiously. Watch for signs of fluid overload ... . Treat seizures with diazepam (Valium) ... . Use proparacaine hydrochloride to assist eye irrigation ... . /Poison A and B/
National Toxicology Program StudiesA bioassay of technical grade ethyl tellurac for possible carcinogenicity was conducted by admin the preparation in feed to F344 rats and B6C3Fl mice. Groups of 50 rats of each sex were admin ethyl tellurac at one of two doses, either 300 or 600 ppm for the males and either 150 or 300 ppm for the females, for 105 wk. Matched controls consisted of 20 untreated rats of each sex. All surviving rats were /sacrificed/ at 105 wk. Groups of 50 mice of each sex were admin ethyl tellurac at one of two doses, initially either 2,500 or 5,000 ppm. Due to signs of toxicity in the dosed animals, these doses were reduced to 500 and 2,000 ppm, respectively, starting at wk 41 for the males and at wk 38 for the females. The reduced doses were maintained for 66 wk for the malesfor the females, the reduced doses were raised after 3 wk to 2,000 and 5,000 ppm, respectively, and maintained at these levels for 66 wk. The time-weighted average doses for the males were either 1,255 or 3,132 ppmfor the females, either 2,132 or 4,915 ppm. Matched controls consisted of 20 untreated mice of each sex. All surviving mice were /sacrificed/ at 106 weeks. ... Survival of the rats and the mice was not affected by the chemical, and sufficient numbers of all groups were at risk for the development of late appearing tumors. ... It is concluded that under the conditions of this bioassay, ethyl tellurac was not carcinogenic for F344 rats or B6C3Fl mice of either sex. The incidence of mesotheliomas in dosed male rats and the incidence of adenomas of the lacrimal (harderian) gland of the eye in dosed mice of either sex provided evidence which was suggestive but under the conditions of the bioassay insufficient to establish the carcinogenicity of ethyl tellurac in these animals. ... Levels of Evidence of Carcinogenicity: Male Rats: EquivocalFemale Rats: NegativeMale Mice: EquivocalFemale Mice: Equivocal.
TSCA inventory statusTSCA listed
GHS pictogramGHS09
GHS hazard statementsH400-H410-H331
REACH registrationsActive
GHS precautionary statementsP273-P391-P501-P261-P271-P304+P340-P311-P321-P403+P233-P405-P501-P273-P391-P501
Hazardous substances data20941-65-5(Hazardous Substances Data)