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Accelerator (DM) ( CASNO:120-78-5 )

Identification and Related Records
Name:
Accelerator (DM)
CAS Registry number:
120-78-5
Synonyms:
2,2'-Dibenzothiazole disulfide
Accelerator MBTS
Dibenzothiazole Disulfide
2,2-D ibenzothiazole Disulfide
2-(1,3-Benzothiazol-2-yldisulfanyl)-1,3-benzothiazole
2,2'-bis(benzothiazolyl)disulfide
2,2'-Dibenzothiazoledisulfide
2,2'-dithiobis-benzothiazol
2-benzothiazyldisulfide
2-Mercaptobenzothiazole disulfide
2-mercaptobenzothiazoledisulfide
2-Mercaptobenzothiazyl disulfide
2-mercaptobenzothiazyldisulfide
Accel TM
accelerator(dm)
AcceleratorDM
AcceleratorMBTS
acceltm
Benzothiazol-2-yl disulfide
Benzothiazole disulfide
Benzothiazole, 2,2'-dithiobis-
benzothiazoledisulfide
benzothiazolyl
Benzothiazyldisuflide
MBTS
EINECS(EC#):
204-424-9
Molecular Formula:
C14H8N2S4
Molecular Weight:
332.47
Inchi:
InChI=1/C14H8N2S4/c1-3-7-11-9(5-1)15-13(17-11)19-20-14-16-10-6-2-4-8-12(10)18-14/h1-8H
InChIKey:
AFZSMODLJJCVPP-UHFFFAOYSA-N
Canonical SMILES:
C1=CC=C2C(=C1)N=C(S2)SSC3=NC4=CC=CC=C4S3
Chemical and Physical Properties
Appearance:
yellow amorphous powder
Density:
1.5
Melting Point:
177-180℃
Boiling Point:
532.5 °C at 760 mmHg
Vapour:
0mmHg at 25°C
Refractive Index:
1.752
Flash Point:
271℃
Water:
<0.01 g/100 mL at 21 ºC
Solubilities:
<0.01 g/100 mL at 21 oC in water
Color/Form:
PALE YELLOW NEEDLES FROM BENZENE
FREE-FLOWING POWDER
Cream to off-white powder or pellets
Stability:
Stable under normal temperatures and pressures.
HS Code:
29342020
Storage temp:
Store in a cool, dry, well-ventilated area away from incompatible substances. Keep containers tightly closed.
Spectral properties:
MAX ABSORPTION: 271 NM (LOG E= 4.32); SADTLER REFERENCE NUMBER: 1344 (IR, PRISM)
IR: 1374 (Coblentz Society Spectral Collection)
UV: 1-544 (Organic Electronic Spectral Data, Phillips et al, John Wiley & Sons, New York)
Computed Properties:
Molecular Weight:332.48672 [g/mol]
Molecular Formula:C14H8N2S4
XLogP3-AA:5.6
H-Bond Donor:0
H-Bond Acceptor:4
Rotatable Bond Count:3
Exact Mass:331.957031
MonoIsotopic Mass:331.957031
Topological Polar Surface Area:133
Heavy Atom Count:20
Formal Charge:0
Complexity:311
Isotope Atom Count:0
Defined Atom Stereocenter Count:0
Undefined Atom Stereocenter Count:0
Defined Bond Stereocenter Count:0
Undefined Bond Stereocenter Count:0
Covalently-Bonded Unit Count:1
Feature 3D Acceptor Count:2
Feature 3D Ring Count:4
Effective Rotor Count:3
Conformer Sampling RMSD:0.6
CID Conformer Count:109
Safety and Handling
Hazard Codes:
Xi:Irritant
Risk Statements:
R31;R43;R50/53
Safety Statements:
S36/37;S60;S61
Safety:
Poison by intravenous and intraperitoneal routes. Slightly toxic by ingestion. Experimental teratogenic and reproductive effects. Questionable carcinogen with experimental tumorigenic data. Mutation data reported. When heated to decomposition it emits very toxic fumes of SOx and NOx. See also SULFIDES.
Hazard Codes:?IrritantXi,DangerousN
Risk Statements: 31-43-50/53
R31 :Contact with acids liberates toxic gas.?
R43:May cause sensitization by skin contact.?
R50/53:Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment.
Safety Statements:?36/37-60-61
S36/37:Wear suitable protective clothing and gloves.?
S60:This material and its container must be disposed of as hazardous waste.?
S61:Avoid release to the environment. Refer to special instructions / safety data sheets.
RIDADR: UN 3077 9/PG 3
WGK Germany: 2
Transport:
UN 3077
Specification:
?2,2'-Dithiobis(benzothiazole) , with CAS number of 120-78-5, can be called 1,2-Bis(2-benzothiazolyl)disulfide ; 2,2'-Benzothiazolyl disulfide ; 2,2'-Benzothiazyl disulfide ; 2,2'-Dibenzothiazole disulfide ; 2,2'-Dibenzothiazolyl disulfide ; 2,2'-Dithiobis ; 2-Benzothiazolyl disulfide ; 2-Mercaptobenzothiazole disulfide ; Bis(2-benzothiazolyl) disulfide ; Bis(benzothiazol-2-yl)disulfide ; Dibenzothiophene disulfide . It is a yellow amorphous powder.? 2,2'-Dithiobis(benzothiazole) (CAS NO.120-78-5) is used as universal promoting agents like the natural rubber, synthetic rubber, reclaimed rubber. 2,2'-Dithiobis(benzothiazole) (CAS NO.120-78-5) is mainly used in the manufacture of tires, tire tube, rubber belt, rubber overshoes and general industrial products. High purity Benzothiazole disulfide (pharmaceutical grade) is the important manufacturing cephalosporin antiphlogistics pharmaceutical intermediates.
Report:
Reported in EPA TSCA Inventory.
Disposal Methods:
SRP: 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.
Use and Manufacturing
Use and Manufacturing:
Methods of Manufacturing

OXIDATION OF 2-MERCAPTOBENZOTHIAZOLE
U.S. Exports

(1972) 9.08X10+8 GRAMS (EST)
(1975) ND
U.S. Imports

(1972) NEGLIGIBLE (EST)
(1975) ND
U.S. Production

(1972) 9.66X10+9 GRAMS
(1975) 7.43X10+9 GRAMS
(1991) 4,419,000 kg
Consumption Patterns

100% AS A RUBBER ACCELERATOR (EST) (1975)
Usage:
Accelerator for natural rubber, styrene-butadiene rubber, nitrile-butadiene rubber, butadiene rubber & for synthetic isoprene rubber.
Biomedical Effects and Toxicity
Biomedical Effects and Toxicity:
To determine the metabolic disposition of (l4)C-2-mercaptobenzothiazole (MBT) and (14)C-2-mercaptobenzothiazole disulfide (MBTS) male and female rats were dosed topically. Topical doses were 36.1 ug/animal for (14)C-MBT and 33.6 ug/animal for (14)C-MBTS. Although more MBT passed through the skin than MBTS and although relative to rats, guinea pigs absorbed a greater percentage of the dose (33.4% compared to 16.1-17.5% of the MBT and 12.2% compared to 5.94-7.87% for MBTS) the disposition of radioactivity derived from the two compounds was similar. Washing of the skin removed more of the radioactivity from guinea pigs than from rats. For both sexes of rats dosed iv with (14)C-MBT 0.602 mg/kg) or (14)C-MBTS 0.571 mg/kg) disposition of the compounds was similar. In 72 hr, 90.9-101% of the dose appeared in the urine and 3.79-15.1% in the feces. At this time a small portion of the administered radioactivity (1.52-1.96% of the dose) remained associated with erythrocytes. Oral dosing of rats for 14 days with unlabeled MBT (0.510 mg/kg/day) prior to a single dose of (14)C-MBT (0.503 mg/kg) or with unlabeled MBTS (0.521 mg/kg/day) prior to a single dose of (14)C-MBTS (0.730 mg/kg). For both sexes disposition of the compounds was similar. At 96 hr after dosing a small portion of the administered radioactivity (1.20-1.69% of the dose) remained associated with erythrocytes most of which was bound to the membranes. For both compounds and sexes 60.8-101% of the radioactivity administered appeared in the urine and 3.46-9.99% in the feces in 96 hr. At the time only trace amounts of radioactivity remained in tissues other than blood. Of these tissues thyroid contained the highest concentration. In the urine there was a detectable MBT or MBTS but there were two metabolites one of which was identified as a thioglucuronide derivative of MBT. The other was possibly a sulfonic acid derivative of MBT. In conclusion there were similarities in absorption, distribution, and metabolism of (14)C-MBT and (14)C-MBTS in rats and in guinea pigs, indicating that (14)C-MBTS was readily converted to (14)C-MBT. [ el Dareer SM et al; J Toxicol Environ Health 27 (1): 65-84 (1989)] PubMed Abstract
Environmental Fate and Exposure Potential
Environmental Fate/Exposure Summary:
TERRESTRIAL FATE: When released to soil, 2,2'-dibenzothiazyl disulfide will be categorized as immobile(3) based on estimated Koc values ranging from 10,960 to 755,000 (1,2). The rate of biodegradation in soil is probably slow (0.8% theoretical BOD in 2 weeks in an aqueous screening test using soil inoculum)(4).
AQUATIC FATE: Volatilization of 2,2'-dibenzothiazyl disulfide from water will not be an important fate process based on an estimated Henry's Law Constant of 2.34X10-13(1,2). Insufficient data are available to predict the relative importance or rate of biodegradation in aquatic conditions although one aqueous screening biodegradation test would suggest slow biodegradation(SRC). Aquatic bioconcentration factors of 1.0-7.2 and 1.4-51 for concentrations of 0.2 mg/l and 0.02 mg/l, respectively, were measured for carp(3). Since 2,2'-dibenzothiazyl disulfide absorbs light >290 nm(4), it has the potential to photolyze, alhtough the kinetics of the potential photlysis are not known(SRC). It is possible that 2,2'-dibenzothiazyl disulfide will adsorb to sediment or particulate material in an aquatic system based on its estimated Koc(SRC).
ATMOSPHERIC FATE: If released to the atmosphere, 2,2'- dibenzothiazyl disulfide will degrade in the ambient atmosphere by reaction with photochemically produced hydroxyl radicals with an estimated half-life of 1.3 hrs(1).
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