2-mercaptobenzimidazole

Structural formula
General
Surname	2-mercaptobenzimidazole
other names	2-benzimidazole thiol 2-sulfanylbenzimidazole o -phenylenethiourea MBI Vulkanox MB
Molecular formula	C 7 H 6 N 2 S
Brief description	yellow odorless powder
External identifiers / databases
CAS number 583-39-1 EC number 209-502-6 ECHA InfoCard 100.008.640 PubChem 707035 Wikidata Q16004147
properties
Molar mass	150.20 g mol −1
Physical state	firmly
density	1.42 g cm −3
Melting point	300-304 ° C 285-290 ° C
solubility	very heavy in water (0.3 g l −1 at 25 ° C)
safety instructions
GHS labeling of hazardous substances danger H and P phrases H: 301-317-372-412 P: 261-280-302 + 352-333 + 313-362 + 364-501
Toxicological data	476 mg kg −1 ( LD 50 ,  rat ,  oral )
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

2-mercaptobenzimidazole is a chemical compound from the benzimidazole group , which is used as an anti-aging agent and for particularly low-vibration, heat-resistant rubber .

Extraction and presentation

2-Mercaptobenzimidazole can be obtained from o -phenylenediamine and potassium O -ethyldithiocarbonate or carbon disulfide .

properties

2-Mercaptobenzimidazole can exist in two tautomeric forms, 1 H -Benzo [ d ] imidazol-2 (3 H ) -thione and 1 H -Benzo [ d ] imidazol-2-thiol:

See also

• 2-mercaptobenzothiazole
• 2-mercaptobenzoxazole

Individual evidence

1. ↑ Lanxess data sheet .
2. ↑ ^{a b c d e f} Entry on 2-benzimidazolthiol in the GESTIS substance database of the IFA , accessed on January 9, 2019(JavaScript required) .
3. ↑ Data sheet 2-mercaptobenzimidazole, 98% from Sigma-Aldrich , accessed on April 1, 2014 ( PDF ).
4. ^ SD Gangolli, Royal Society of Chemistry (Great Britain): The Dictionary of Substances and Their Effects (DOSE): Volume 05 KN . Royal Society of Chemistry, 1999, ISBN 0-85404-828-6 , pp. 210 .
5. ↑ ^{a b} entry on benzimidazole-2-thiol. In: Römpp Online . Georg Thieme Verlag, accessed April 1, 2014.
6. ^ Robert A. Smiley “Phenylene- and Toluenediamines” in Ullmann's Encyclopedia of Industrial Chemistry , 2002, Wiley-VCH, Weinheim. doi : 10.1002 / 14356007.a19_405 p. 4.