5-Amino-2-benzimidazolethiol Chemical Properties

Melting point:

240-244 °C (lit.)

Boiling point:

356.8±44.0 °C(Predicted)

Density 

1.2404 (rough estimate)

refractive index 

1.5605 (estimate)

storage temp. 

Keep in dark place,Inert atmosphere,Room temperature

solubility 

DMSO (Slightly), Methanol (Slightly, Heated)

form 

powder to crystal

pka

10.44±0.30(Predicted)

color 

Light yellow to Amber to Dark green

Stability:

Stable under recommended storage conditions., Stable Under Recommended Storage C

InChI

InChI=1S/C7H7N3S/c8-4-1-2-5-6(3-4)10-7(11)9-5/h1-3H,8H2,(H2,9,10,11)

InChIKey

BXDMTLVCACMNJO-UHFFFAOYSA-N

SMILES

C1(=S)NC2=CC=C(N)C=C2N1

CAS DataBase Reference

2818-66-8(CAS DataBase Reference)

EPA Substance Registry System

2H-Benzimidazole-2-thione, 5-amino-1,3-dihydro- (2818-66-8)

Safety Information

Hazard Codes 

Xi

Risk Statements 

36/37/38

Safety Statements 

26-36

WGK Germany 

3

TSCA 

TSCA listed

HS Code 

2933998090

Storage Class

11 - Combustible Solids

Hazard Classifications

Eye Irrit. 2
Skin Irrit. 2
STOT SE 3

MSDS

• Language:English Provider:SigmaAldrich
• Language:English Provider:ACROS

5-Amino-2-benzimidazolethiol Usage And Synthesis

Uses

Compounds with a benzimidazole structure, led by omeprazole, can inhibit the acid secretion of gastric parietal cells induced by any stimulus, thus inhibiting the final step of gastric acid being pumped from the parietal cells into the gastric lumen, and therefore have the best therapeutic effect. 5-Amino-2-mercaptobenzimidazole, as an important starting material or intermediate for this type of drug, has a huge market demand.

Chemical Properties

off-white to light yellow crystalline powder

Synthesis

Dissolve 2-mercapto-5-nitrobenzimidazole in methanol, ethanol, dichloromethane, trichloromethane or tetrahydrofuran and add 5-20 equivalents of zinc powder in batches. Concentrated hydrochloric acid is slowly added to the mixture until said mixture is colorless. At the end of the reaction, the insoluble material is removed by filtration, and the filtrate is adjusted to pH=9-10 by adding saturated potassium carbonate solution. activated carbon is added to decolorize the reaction, and the reaction continues to be heated and refluxed for 0.5-2 h. The reaction is filtered through diatomaceous earth, and dried to obtain a yellow solid of 5-amino-2-mercaptobenzimidazole.

5-Amino-2-benzimidazolethiol(2818-66-8)Related Product Information

• Glycine
• 2-Ethylhexyl mercaptoacetate
• 2-Chlorobenzimidazole
• ALTRENOGEST
• 2-Aminobenzimidazole
• 2-Mercaptobenzimidazole
• Benzimidazole
• 5-Amino-1,3-dihydro-2H-benzimidazol-2-one
• Betaine
• Mercaptoacetic acid
• Calcium thioglycolate
• 3-Mercaptopropionic acid
• Ilaprazole
• 2-MERCAPTO-5-NITROBENZIMIDAZOLE
• 2-Mercaptoethanol
• 1H-BENZOIMIDAZOLE-2-THIOL
• 1H-BENZOIMIDAZOL-5-YLAMINE
• 5-Aminobenzimidazole