Benzimidazole

Benzimidazole
Names
	Preferred IUPAC name 1H-1,3-Benzimidazole
	Other names 1H-Benzo[d]imidazole
Identifiers
CAS Number	51-17-2 ;
3D model (JSmol)	Interactive image;
Beilstein Reference	109682
ChEBI	CHEBI:41275 ;
ChEMBL	ChEMBL306226 ;
ChemSpider	5593 ;
DrugBank	DB02962;
ECHA InfoCard	100.000.075
EC Number	200-081-4;
Gmelin Reference	3106
KEGG	C02009 ;
PubChem CID	5798;
UNII	E24GX49LD8 ;
CompTox Dashboard (EPA)	DTXSID8024573 ;
	InChI InChI=1S/C7H6N2/c1-2-4-7-6(3-1)8-5-9-7/h1-5H,(H,8,9) Key: HYZJCKYKOHLVJF-UHFFFAOYSA-N ; InChI=1/C7H6N2/c1-2-4-7-6(3-1)8-5-9-7/h1-5H,(H,8,9) Key: HYZJCKYKOHLVJF-UHFFFAOYAX;
	SMILES c1ccc2c(c1)[nH]cn2;
Properties
Chemical formula	C7H6N2
Molar mass	118.139 g·mol−1
Melting point	170 to 172 °C (338 to 342 °F; 443 to 445 K)
Acidity (pKa)	12.8 (for benzimidazole) and 5.6 (for the conjugate acid)
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H302, H315, H319, H335
Precautionary statements	P261, P264, P270, P271, P280, P301+P312, P302+P352, P304+P340, P305+P351+P338, P312, P321, P330, P332+P313, P337+P313, P362, P403+P233, P405, P501
Safety data sheet (SDS)	External MSDS
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Benzimidazole is a heterocyclic aromatic organic compound. This bicyclic compound may be viewed as fused rings of the aromatic compounds benzene and imidazole. It is a white solid that appears in form of tabular crystals.^[2]

^ Walba, Harold; Isensee, Robert W. (1961). "Acidity Constants of Some Arylimidazoles and Their Cations". The Journal of Organic Chemistry. 26 (8): 2789–2791. doi:10.1021/jo01066a039.
^ "Benzimidazole | CAMEO Chemicals | NOAA". cameochemicals.noaa.gov. Retrieved 2023-01-11.